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105-467: The dog is a domesticated canid species, Canis familiaris . Dog ( s ), doggy , or doggie may also refer to: Dog The dog ( Canis familiaris or Canis lupus familiaris ) is a domesticated descendant of the wolf . Also called the domestic dog , it was selectively bred from an extinct population of wolves during the Late Pleistocene by hunter-gatherers . The dog

210-404: A "difference in motivation" between wolves and dogs. Some puppies and dogs engage in coprophagy out of habit, stress, for attention, or boredom; most of them will not do it later in life. A study hypothesizes that the behavior was inherited from wolves, a behavior likely evolved to lessen the presence of intestinal parasites in dens. Most dogs can swim. In a study of 412 dogs, around 36.5% of

315-468: A 2024 UK study analyzing 584,734 dogs, it was concluded that purebred dogs lived longer than crossbred dogs, challenging the previous notion of the latter having the higher life expectancies. The authors noted that their study included " designer dogs " as crossbred and that purebred dogs were typically given better care than their crossbred counterparts, which likely influenced the outcome of the study. Other studies also show that fully mongrel dogs live about

420-471: A certain work or role. Their behavioural traits include guarding, herding, hunting, retrieving, and scent detection. Their personality traits include hypersocial behavior, boldness, and aggression. Present-day dogs are dispersed around the world. An example of this dispersal is the numerous modern breeds of European lineage during the Victorian era. Dogs are extremely variable in size, ranging from one of

525-644: A control method for overpopulation. Neutering often occurs as early as 6–14 weeks in shelters in the US. The American Society for the Prevention of Cruelty to Animals (ASPCA) advises that dogs not intended for further breeding should be neutered so that they do not have undesired puppies that may later be euthanized. However, the Society for Theriogenology and the American College of Theriogenologists made

630-518: A day, whereas people in agricultural and industrial societies work on average 8.8 hours a day. Sahlins' theory has been criticized for only including time spent hunting and gathering while omitting time spent on collecting firewood, food preparation, etc. Other scholars also assert that hunter-gatherer societies were not "affluent" but suffered from extremely high infant mortality, frequent disease, and perennial warfare. Researchers Gurven and Kaplan have estimated that around 57% of hunter-gatherers reach

735-559: A diet high in protein and low in other macronutrients results in the body using the protein as energy, possibly leading to protein deficiency. Lean meat especially becomes a problem when animals go through a lean season that requires them to metabolize fat deposits. In areas where plant and fish resources are scarce, hunter-gatherers may trade meat with horticulturalists for carbohydrates . For example, tropical hunter-gatherers may have an excess of protein but be deficient in carbohydrates, and conversely tropical horticulturalists may have

840-636: A joint statement that opposes mandatory neutering; they said that the cause of overpopulation in the US is cultural. Neutering is less common in most European countries, especially in Nordic countries —except for the UK, where it is common. In Norway, neutering is illegal unless for the benefit of the animal's health (e.g., ovariohysterectomy in case of ovarian or uterine neoplasia). Some European countries have similar laws to Norway, but their wording either explicitly allows for neutering for controlling reproduction or it

945-781: A more constant supply of sustenance. In 2018, 9000-year-old remains of a female hunter along with a toolkit of projectile points and animal processing implements were discovered at the Andean site of Wilamaya Patjxa, Puno District in Peru . A 2020 study inspired by this discovery found that of 27 identified burials with hunter gatherers of a known sex who were also buried with hunting tools, 11 were female hunter gatherers, while 16 were male hunter gatherers. Combined with uncertainties, these findings suggest that anywhere from 30 to 50 percent of big game hunters were female. A 2023 study that looked at studies of contemporary hunter gatherer societies from

1050-499: A natural instinct called prey drive (the term is chiefly used to describe training dogs ' habits) which can be influenced by breeding. These instincts can drive dogs to consider objects or other animals to be prey or drive possessive behavior. These traits have been enhanced in some breeds so that they may be used to hunt and kill vermin or other pests. Puppies or dogs sometimes bury food underground . One study found that wolves outperformed dogs in finding food caches, likely due to

1155-401: A north–south position in calm magnetic field conditions. Dogs' vision is dichromatic ; their visual world consists of yellows, blues, and grays. They have difficulty differentiating between red and green, and much like other mammals, the dog's eye is composed of two types of cone cells compared to the human's three. The divergence of the eye axis of dogs ranges from 12 to 25°, depending on

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1260-511: A paper entitled, " Notes on the Original Affluent Society ", in which he challenged the popular view of hunter-gatherers lives as "solitary, poor, nasty, brutish and short", as Thomas Hobbes had put it in 1651. According to Sahlins, ethnographic data indicated that hunter-gatherers worked far fewer hours and enjoyed more leisure than typical members of industrial society, and they still ate well. Their "affluence" came from

1365-494: A set of social-cognitive abilities in domestic dogs that are not possessed by the dog's canine relatives or other highly intelligent mammals, such as great apes , are parallel to children's social-cognitive skills. Most domestic animals were initially bred for the production of goods. Dogs, on the other hand, were selectively bred for desirable behavioral traits. In 2016, a study found that only 11 fixed genes showed variation between wolves and dogs. These gene variations indicate

1470-599: A size of a few dozen people. It remained the only mode of subsistence until the end of the Mesolithic period some 10,000 years ago, and after this was replaced only gradually with the spread of the Neolithic Revolution . The Late Pleistocene witnessed the spread of modern humans outside of Africa as well as the extinction of all other human species. Humans spread to the Australian continent and

1575-405: A smaller selection of (often larger) game and gathering a smaller selection of food. This specialization of work also involved creating specialized tools such as fishing nets , hooks, and bone harpoons . The transition into the subsequent Neolithic period is chiefly defined by the unprecedented development of nascent agricultural practices. Agriculture originated as early as 12,000 years ago in

1680-458: A study of Boxer litters, 22% of puppies died before reaching 7 weeks of age. Stillbirth was the most frequent cause of death, followed by infection. Mortality due to infection increased significantly with increases in inbreeding. Dog behavior has been shaped by millennia of contact with humans. They have acquired the ability to understand and communicate with humans and are uniquely attuned to human behaviors. Behavioral scientists suggest that

1785-536: A study of seven dog breeds (the Bernese Mountain Dog , Basset Hound , Cairn Terrier , Brittany , German Shepherd Dog , Leonberger , and West Highland White Terrier ), it was found that inbreeding decreases litter size and survival. Another analysis of data on 42,855 Dachshund litters found that as the inbreeding coefficient increased, litter size decreased and the percentage of stillborn puppies increased, thus indicating inbreeding depression. In

1890-432: A surplus of carbohydrates but inadequate protein. Trading may thus be the most cost-effective means of acquiring carbohydrate resources. Hunter-gatherer societies manifest significant variability, depending on climate zone / life zone , available technology, and societal structure. Archaeologists examine hunter-gatherer tool kits to measure variability across different groups. Collard et al. (2005) found temperature to be

1995-497: A wide geographical area, thus there were regional variations in lifestyles. However, all the individual groups shared a common style of stone tool production, making knapping styles and progress identifiable. This early Paleo-Indian period lithic reduction tool adaptations have been found across the Americas, utilized by highly mobile bands consisting of approximately 25 to 50 members of an extended family. The Archaic period in

2100-698: A workshop hosted by the IUCN /Species Survival Commission's Canid Specialist Group considered the dingo and the New Guinea singing dog to be feral Canis familiaris . Therefore, it did not assess them for the IUCN Red List of threatened species . The earliest remains generally accepted to be those of a domesticated dog were discovered in Bonn-Oberkassel , Germany. Contextual , isotopic , genetic , and morphological evidence shows that this dog

2205-548: A year longer on average than dogs with pedigrees. Furthermore, small dogs with longer muzzles have been shown to have higher lifespans than larger medium-sized dogs with much more depressed muzzles. For free-ranging dogs, less than 1 in 5 reach sexual maturity, and the median life expectancy for feral dogs is less than half of dogs living with humans. In domestic dogs, sexual maturity happens around six months to one year for both males and females, although this can be delayed until up to two years of age for some large breeds. This

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2310-405: Is a domestic animal that likely travelled a commensal pathway into domestication (i.e. humans initially neither benefitted nor were harmed by wild dogs eating refuse from their camps). The questions of when and where dogs were first domesticated remains uncertain. Genetic studies suggest a domestication process commencing over 25,000 years ago, in one or several wolf populations in either Europe,

2415-653: Is a notable genus with 5 species in which dogs are the definitive host . Additionally, dogs are a source of zoonoses for humans. They are responsible for 99% of rabies cases worldwide; however, in some developed countries such as the UK, rabies is absent from dogs and is instead only transmitted by bats. Other common zoonoses are hydatid disease , leptospirosis , pasteurellosis , ringworm , and toxocariasis . Common infections in dogs include canine adenovirus , canine distemper virus , canine parvovirus , leptospirosis , canine influenza , and canine coronavirus . All of these conditions have vaccines available. Dogs are

2520-432: Is allowed in practice or by contradiction through other laws. Italy and Portugal have passed recent laws that promote it. Germany forbids early age neutering, but neutering is still allowed at the usual age. In Romania, neutering is mandatory except for when a pedigree to select breeds can be shown. A common breeding practice for pet dogs is to mate them between close relatives (e.g., between half- and full-siblings). In

2625-468: Is associated with impulsive behaviors , anxiety behaviors, and fear of unfamiliar noise, people, or animals. Some dog breeds are hairless, while others have a very thick corded coat. The coats of certain breeds are often groomed to a characteristic style, for example, the Yorkshire Terrier 's "show cut". A dog's dewclaw is the fifth digit in its forelimb and hind legs. Dewclaws on

2730-700: Is closely related to the ancestor of domestic dogs. In 2018, a study identified 429 genes that differed between modern dogs and modern wolves. As the differences in these genes could also be found in ancient dog fossils, these were regarded as being the result of the initial domestication and not from recent breed formation. These genes are linked to neural crest and central nervous system development. These genes affect embryogenesis and can confer tameness, smaller jaws, floppy ears, and diminished craniofacial development, which distinguish domesticated dogs from wolves and are considered to reflect domestication syndrome. The study concluded that during early dog domestication,

2835-423: Is dominated by a large visual cortex , the dog brain is dominated by a large olfactory cortex . Dogs have roughly forty times more smell-sensitive receptors than humans, ranging from about 125   million to nearly 300   million in some dog breeds, such as bloodhounds . This sense of smell is the most prominent sense of the species; it detects chemical changes in the environment, allowing dogs to pinpoint

2940-685: Is inhospitable to large scale economic exploitation and maintain their subsistence based on hunting and gathering, as well as incorporating a small amount of manioc horticulture that supplements, but is not replacing, reliance on foraged foods. Evidence suggests big-game hunter-gatherers crossed the Bering Strait from Asia (Eurasia) into North America over a land bridge ( Beringia ), that existed between 47,000 and 14,000 years ago. Around 18,500–15,500 years ago, these hunter-gatherers are believed to have followed herds of now-extinct Pleistocene megafauna along ice-free corridors that stretched between

3045-409: Is never total but is striking when viewed in an evolutionary context. One of humanity's two closest primate relatives, chimpanzees , are anything but egalitarian, forming themselves into hierarchies that are often dominated by an alpha male . So great is the contrast with human hunter-gatherers that it is widely argued by paleoanthropologists that resistance to being dominated was a key factor driving

3150-461: Is not found in any other canid . In the 2005 edition of Mammal Species of the World , mammalogist W. Christopher Wozencraft listed the wolf as a wild subspecies of Canis lupus and proposed two additional subspecies: familiaris , as named by Linnaeus in 1758, and dingo , named by Meyer in 1793. Wozencraft included hallstromi (the New Guinea singing dog) as another name ( junior synonym ) for

3255-456: Is not necessarily a one-way process. It has been argued that hunting and gathering represents an adaptive strategy , which may still be exploited, if necessary, when environmental change causes extreme food stress for agriculturalists. In fact, it is sometimes difficult to draw a clear line between agricultural and hunter-gatherer societies, especially since the widespread adoption of agriculture and resulting cultural diffusion that has occurred in

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3360-666: Is opposed by many veterinary and animal welfare organisations such as the American Veterinary Medical Association and the British Veterinary Association . Evidence from veterinary practices and questionnaires showed that around 500 dogs would need to have their tail docked to prevent one injury. Numerous disorders have been known to affect dogs. Some are congenital and others are acquired. Dogs can acquire upper respiratory tract diseases including diseases that affect

3465-753: Is significant divergence in terms of skull shape between types. The three basic skull shapes are the elongated dolichocephalic type as seen in sighthounds , the intermediate mesocephalic or mesaticephalic type, and the very short and broad brachycephalic type exemplified by mastiff type skulls. The jaw contains around 42 teeth, and it has evolved for the consumption of flesh. Dogs use their carnassial teeth to cut food into bite-sized chunks, more especially meat. Dogs' senses include vision, hearing, smell, taste, touch, and magnetoreception . One study suggests that dogs can feel small variations in Earth's magnetic field . Dogs prefer to defecate with their spines aligned in

3570-405: Is the field of study whereby food plants of various peoples and tribes worldwide are documented. Most hunter-gatherers are nomadic or semi-nomadic and live in temporary settlements. Mobile communities typically construct shelters using impermanent building materials, or they may use natural rock shelters, where they are available. Some hunter-gatherer cultures, such as the indigenous peoples of

3675-442: Is the terminal appendage of the vertebral column , which is made up of a string of 5 to 23 vertebrae enclosed in muscles and skin that support the dog's back extensor muscles. One of the primary functions of a dog's tail is to communicate their emotional state. The tail also helps the dog maintain balance by putting its weight on the opposite side of the dog's tilt, and it can also help the dog spread its anal gland 's scent through

3780-404: Is the time at which female dogs will have their first estrous cycle , characterized by their vulvas swelling and producing discharges , usually lasting between 4 and 20 days. They will experience subsequent estrous cycles semiannually, during which the body prepares for pregnancy . At the peak of the cycle, females will become estrous, mentally and physically receptive to copulation . Because

3885-837: Is well adapted for running; the vertebrae on the neck and back have extensions for back muscles, consisting of epaxial muscles and hypaxial muscles , to connect to; the long ribs provide room for the heart and lungs ; and the shoulders are unattached to the skeleton, allowing for flexibility. Compared to the dog's wolf-like ancestors, selective breeding since domestication has seen the dog's skeleton increase in size for larger types such as mastiffs and miniaturised for smaller types such as terriers ; dwarfism has been selectively bred for some types where short legs are preferred, such as dachshunds and corgis . Most dogs naturally have 26 vertebrae in their tails, but some with naturally short tails have as few as three. The dog's skull has identical components regardless of breed type, but there

3990-477: The Fertile Crescent , Ancient India , Ancient China , Olmec , Sub-Saharan Africa and Norte Chico . As a result of the now near-universal human reliance upon agriculture, the few contemporary hunter-gatherer cultures usually live in areas unsuitable for agricultural use. Archaeologists can use evidence such as stone tool use to track hunter-gatherer activities, including mobility. Ethnobotany

4095-570: The Ju'/hoansi people of Namibia, women help men track down quarry. In the Australian Martu, both women and men participate in hunting but with a different style of gendered division; while men are willing to take more risks to hunt bigger animals such as kangaroo for political gain as a form of "competitive magnanimity", women target smaller game such as lizards to feed their children and promote working relationships with other women, preferring

4200-438: The Late Pleistocene . DNA sequences show that all ancient and modern dogs share a common ancestry and descended from an ancient, extinct wolf population that was distinct from any modern wolf lineage. Some studies have posited that all living wolves are more closely related to each other than to dogs, while others have suggested that dogs are more closely related to modern Eurasian wolves than to American wolves. The dog

4305-838: The Laurentide and Cordilleran ice sheets. Another route proposed is that, either on foot or using primitive boats , they migrated down the Pacific coast to South America. Hunter-gatherers would eventually flourish all over the Americas, primarily based in the Great Plains of the United States and Canada, with offshoots as far east as the Gaspé Peninsula on the Atlantic coast , and as far south as Chile , Monte Verde . American hunter-gatherers were spread over

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4410-595: The Middle East , and also independently originated in many other areas including Southeast Asia , parts of Africa , Mesoamerica , and the Andes . Forest gardening was also being used as a food production system in various parts of the world over this period. Many groups continued their hunter-gatherer ways of life, although their numbers have continually declined, partly as a result of pressure from growing agricultural and pastoral communities. Many of them reside in

4515-514: The Southwest , Arctic , Poverty Point , Dalton and Plano traditions. These regional adaptations would become the norm, with reliance less on hunting and gathering, with a more mixed economy of small game, fish , seasonally wild vegetables and harvested plant foods. Scholars like Kat Anderson have suggested that the term Hunter-gatherer is reductive because it implies that Native Americans never stayed in one place long enough to affect

4620-416: The human–canine bond has been a topic of frequent study, and dogs' influence on human society has given them the sobriquet of " man's best friend ". The global dog population is estimated at 700 million to 1 billion, distributed around the world . The dog is the most popular pet in the United States, present in 34–40% of households. In developed countries, around 20% of dogs are kept as pets, while 75% of

4725-406: The mammary glands , ovaries , and other reproductive organs . However, neutering increases the risk of urinary incontinence in bitches, prostate cancer in dogs, and osteosarcoma , hemangiosarcoma , cruciate ligament rupture , pyometra , obesity , and diabetes mellitus in either sex. Neutering is the most common surgical procedure in dogs less than a year old in the US and is seen as

4830-468: The military . Communication in dogs includes eye gaze, facial expression, vocalization, body posture (including movements of bodies and limbs), and gustatory communication (scents, pheromones, and taste). They mark their territories by urinating on them, which is more likely when entering a new environment. Over the millennia, dogs became uniquely adapted to human behavior; this adaptation includes being able to understand and communicate with humans. As such,

4935-1166: The nasal cavity , the larynx , and the trachea ; lower respiratory tract diseases which includes pulmonary disease and acute respiratory diseases; heart diseases which includes any cardiovascular inflammation or dysfunction of the heart; haemopoietic diseases including anaemia and clotting disorders ; gastrointestinal disease such as diarrhoea and gastric dilatation volvulus ; hepatic disease such as portosystemic shunts and liver failure ; pancreatic disease such as pancreatitis ; renal disease ; lower urinary tract disease such as cystitis and urolithiasis ; endocrine disorders such as diabetes mellitus , Cushing's syndrome , hypoadrenocorticism , and hypothyroidism ; nervous system diseases such as seizures and spinal injury ; musculoskeletal disease such as arthritis and myopathies ; dermatological disorders such as alopecia and pyoderma ; ophthalmological diseases such as conjunctivitis , glaucoma , entropion , and progressive retinal atrophy ; and neoplasia . Common dog parasites are lice , fleas , fly larvae , ticks , mites , cestodes , nematodes , and coccidia . Taenia

5040-473: The ova survive and can be fertilized for a week after ovulation, more than one male can sire the same litter. Fertilization typically occurs two to five days after ovulation. After ejaculation , the dogs are coitally tied for around 5–30 minutes because of the male's bulbus glandis swelling and the female's constrictor vestibuli contracting; the male will continue ejaculating until they untie naturally due to muscle relaxation . 14–16 days after ovulation,

5145-552: The 1800s to the present day found that women hunted in 79 percent of hunter gatherer societies. However, an attempted verification of this study found "that multiple methodological failures all bias their results in the same direction...their analysis does not contradict the wide body of empirical evidence for gendered divisions of labor in foraging societies". At the 1966 " Man the Hunter " conference, anthropologists Richard Borshay Lee and Irven DeVore suggested that egalitarianism

5250-818: The Americas began when Paleolithic hunter-gatherers entered North America from the North Asian mammoth steppe via the Beringia land bridge. During the 1970s, Lewis Binford suggested that early humans obtained food via scavenging , not hunting . Early humans in the Lower Paleolithic lived in forests and woodlands , which allowed them to collect seafood, eggs, nuts, and fruits besides scavenging. Rather than killing large animals for meat, according to this view, they used carcasses of such animals that had either been killed by predators or that had died of natural causes. Scientists have demonstrated that

5355-401: The Americas saw a changing environment featuring a warmer more arid climate and the disappearance of the last megafauna. The majority of population groups at this time were still highly mobile hunter-gatherers. Individual groups started to focus on resources available to them locally, however, and thus archaeologists have identified a pattern of increasing regional generalization, as seen with

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5460-479: The Americas for the first time, coincident with the extinction of numerous predominantly megafaunal species. Major extinctions were incurred in Australia beginning approximately 50,000 years ago and in the Americas about 15,000 years ago. Ancient North Eurasians lived in extreme conditions of the mammoth steppes of Siberia and survived by hunting mammoths , bison and woolly rhinoceroses. The settlement of

5565-670: The Northwest Coast of North America and the Calusa in Florida ) are an exception to this rule. For example, the San people or "Bushmen" of southern Africa have social customs that strongly discourage hoarding and displays of authority, and encourage economic equality via sharing of food and material goods. Karl Marx defined this socio-economic system as primitive communism . The egalitarianism typical of human hunters and gatherers

5670-881: The Pacific Northwest Coast and the Yokuts , lived in particularly rich environments that allowed them to be sedentary or semi-sedentary. Amongst the earliest example of permanent settlements is the Osipovka culture (14–10.3 thousand years ago), which lived in a fish-rich environment that allowed them to be able to stay at the same place all year. One group, the Chumash , had the highest recorded population density of any known hunter and gatherer society with an estimated 21.6 persons per square mile. Hunter-gatherers tend to have an egalitarian social ethos, although settled hunter-gatherers (for example, those inhabiting

5775-582: The Swedish botanist and zoologist Carl Linnaeus assigned the genus name Canis (which is the Latin word for "dog") to the domestic dog, the wolf , and the golden jackal in his book, Systema Naturae . He classified the domestic dog as Canis familiaris and, on the next page, classified the grey wolf as Canis lupus . Linnaeus considered the dog to be a separate species from the wolf because of its upturning tail ( cauda recurvata in Latin term), which

5880-412: The age of 15. Of those that reach 15 years of age, 64% continue to live to or past the age of 45. This places the life expectancy between 21 and 37 years. They further estimate that 70% of deaths are due to diseases of some kind, 20% of deaths come from violence or accidents and 10% are due to degenerative diseases. Mutual exchange and sharing of resources (i.e., meat gained from hunting) are important in

5985-477: The arguments put forward by Wilmsen. Doron Shultziner and others have argued that we can learn a lot about the life-styles of prehistoric hunter-gatherers from studies of contemporary hunter-gatherers—especially their impressive levels of egalitarianism. There are nevertheless a number of contemporary hunter-gatherer peoples who, after contact with other societies, continue their ways of life with very little external influence or with modifications that perpetuate

6090-399: The breed, which can have different retina configurations. The fovea centralis area of the eye is attached to a nerve fiber , and is the most sensitive to photons . Additionally, a study found that dogs' visual acuity was up to eight times less effective than a human, and their ability to discriminate levels of brightness was about two times worse than a human. While the human brain

6195-407: The cause and vice versa. The typical lifespan of dogs varies widely among breeds, but the median longevity (the age at which half the dogs in a population have died and half are still alive) is approximately 12.7 years. Obesity correlates negatively with longevity with one study finding obese dogs to have a life expectancy approximately a year and a half less than dogs with a healthy weight. In

6300-835: The companion animal most frequently reported for exposure to toxins . Most poisonings are accidental and over 80% of reports of exposure to the ASPCA animal poisoning hotline are due to oral exposure. The most common substances people report exposure to are: pharmaceuticals, toxic foods, and rodenticides . Data from the Pet Poison Helpline shows that human drugs are the most frequent cause of toxicosis death. The most common household products ingested are cleaning products. Most food related poisonings involved theobromine poisoning (chocolate). Other common food poisonings include xylitol , Vitis (grapes, raisins, etc.) and Allium (garlic, oninions, etc.). Pyrethrin insecticides were

6405-400: The country of Denmark in 2007. In addition, wealth transmission across generations was also a feature of hunter-gatherers, meaning that "wealthy" hunter-gatherers, within the context of their communities, were more likely to have children as wealthy as them than poorer members of their community and indeed hunter-gatherer societies demonstrate an understanding of social stratification. Thus while

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6510-532: The developing world, either in arid regions or tropical forests. Areas that were formerly available to hunter-gatherers were—and continue to be—encroached upon by the settlements of agriculturalists. In the resulting competition for land use, hunter-gatherer societies either adopted these practices or moved to other areas. In addition, Jared Diamond has blamed a decline in the availability of wild foods, particularly animal resources. In North and South America , for example, most large mammal species had gone extinct by

6615-621: The diet until relatively recently, during the Late Stone Age in southern Africa and the Upper Paleolithic in Europe. Fat is important in assessing the quality of game among hunter-gatherers, to the point that lean animals are often considered secondary resources or even starvation food. Consuming too much lean meat leads to adverse health effects like protein poisoning , and can in extreme cases lead to death. Additionally,

6720-480: The dingo. This classification was informed by a 1999 mitochondrial DNA study. The classification of dingoes is disputed and a political issue in Australia. Classifying dingoes as wild dogs simplifies reducing or controlling dingo populations that threaten livestock. Treating dingoes as a separate species allows conservation programs to protect the dingo population. Dingo classification affects wildlife management policies, legislation, and societal attitudes. In 2019,

6825-489: The dogs could not swim; the other 63.5% were able to swim without a trainer in a swimming pool . A study of 55 dogs found a correlation between swimming and 'improvement' of the hip osteoarthritis joint . The female dog may produce colostrum , a type of milk high in nutrients and antibodies, 1–7 days before giving birth. Milk production lasts for around three months, and increases with litter size. The dog can sometimes vomit and refuse food during child contractions . In

6930-409: The economic systems of hunter-gatherer societies. Therefore, these societies can be described as based on a " gift economy ". A 2010 paper argued that while hunter-gatherers may have lower levels of inequality than modern, industrialised societies, that does not mean inequality does not exist. The researchers estimated that the average Gini coefficient amongst hunter-gatherers was 0.25, equivalent to

7035-597: The embryo attaches to the uterus , and after seven to eight more days, a heartbeat is detectable. Dogs bear their litters roughly 58 to 68 days after fertilization , with an average of 63 days, although the length of gestation can vary. An average litter consists of about six puppies . Neutering is the sterilization of animals via gonadectomy , which is an orchidectomy (castration) in dogs and ovariohysterectomy (spay) in bitches. Neutering reduces problems caused by hypersexuality , especially in male dogs. Spayed females are less likely to develop cancers affecting

7140-553: The end of the Pleistocene —according to Diamond, because of overexploitation by humans, one of several explanations offered for the Quaternary extinction event there. As the number and size of agricultural societies increased, they expanded into lands traditionally used by hunter-gatherers. This process of agriculture-driven expansion led to the development of the first forms of government in agricultural centers, such as

7245-466: The environment around them. However, many of the landscapes in the Americas today are due to the way the Natives of that area originally tended the land. Anderson specifically looks at California Natives and the practices they utilized to tame their land. Some of these practices included pruning, weeding, sowing, burning, and selective harvesting. These practices allowed them to take from the environment in

7350-399: The evidence for early human behaviors for hunting versus carcass scavenging vary based on the ecology, including the types of predators that existed and the environment. According to the endurance running hypothesis , long-distance running as in persistence hunting , a method still practiced by some hunter-gatherer groups in modern times, was likely the driving evolutionary force leading to

7455-460: The evolution of certain human characteristics. This hypothesis does not necessarily contradict the scavenging hypothesis: both subsistence strategies may have been in use sequentially, alternately or even simultaneously. Starting at the transition between the Middle to Upper Paleolithic period, some 80,000 to 70,000 years ago, some hunter-gatherer bands began to specialize, concentrating on hunting

7560-613: The evolutionary emergence of human consciousness , language , kinship and social organization . Most anthropologists believe that hunter-gatherers do not have permanent leaders; instead, the person taking the initiative at any one time depends on the task being performed. Within a particular tribe or people, hunter-gatherers are connected by both kinship and band (residence/domestic group) membership. Postmarital residence among hunter-gatherers tends to be matrilocal, at least initially. Young mothers can enjoy childcare support from their own mothers, who continue living nearby in

7665-604: The expense of problem-solving ability . In a 2023 study of 58 dogs, some dogs classified as attention deficit hyperactivity disorder -like showed lower serotonin and dopamine concentrations. A similar study claims that hyperactivity is more common in male and young dogs. A dog can become aggressive because of trauma or abuse, fear or anxiety, territorial protection, or protecting an item it considers valuable. Acute stress reactions from post-traumatic stress disorder (PTSD) seen in dogs can evolve into chronic stress . Police dogs with PTSD can often refuse to work. Dogs have

7770-533: The family Canidae . They are classified as a subspecies of Canis lupus , along with wolves and dingoes . Dogs were domesticated from wolves over 14,000 years ago by hunter-gatherers , before the development of agriculture. The dingo and the related New Guinea singing dog resulted from the geographic isolation and feralization of dogs in Oceania over 8,000 years ago. Dogs, wolves, and dingoes have sometimes been classified as separate species. In 1758,

7875-449: The forelimbs are attached by bone and ligament, while the dewclaws on the hind legs are attached only by skin. Most dogs aren't born with dewclaws in their hind legs, and some are without them in their forelimbs. Dogs' dewclaws consist of the proximal phalanges and distal phalanges . Some publications theorize that dewclaws in wolves, who usually do not have dewclaws, were a sign of hybridization with dogs. A dog's tail

7980-453: The high Arctic, or eastern Asia. In 2021, a literature review of the current evidence infers that the dog was domesticated in Siberia 23,000 years ago by ancient North Siberians , then later dispersed eastward into the Americas and westward across Eurasia, with dogs likely accompanying the first humans to inhabit the Americas. Some studies have suggested that the extinct Japanese wolf

8085-400: The idea that they were satisfied with very little in the material sense. Later, in 1996, Ross Sackett performed two distinct meta-analyses to empirically test Sahlin's view. The first of these studies looked at 102 time-allocation studies, and the second one analyzed 207 energy-expenditure studies. Sackett found that adults in foraging and horticultural societies work on average, about 6.5 hours

8190-458: The initial selection was for behavior. This trait is influenced by those genes which act in the neural crest, which led to the phenotypes observed in modern dogs. There are around 450 official dog breeds , the most of any mammal. Dogs began diversifying in the Victorian era , when humans took control of their natural selection. Most breeds were derived from small numbers of founders within

8295-580: The largest breeds, the Great Dane , at 50 to 79 kg (110 to 174 lb) and 71 to 81 cm (28 to 32 in), to one of the smallest, the Chihuahua , at 0.5 to 3 kg (1.1 to 6.6 lb) and 13 to 20 cm (5.1 to 7.9 in). All healthy dogs, regardless of their size and type, have the same amount of bones (with the exception of the tail), although there is significant skeletal variation between dogs of different types. The dog's skeleton

8400-655: The last 10,000 years. Nowadays, some scholars speak about the existence within cultural evolution of the so-called mixed-economies or dual economies which imply a combination of food procurement (gathering and hunting) and food production or when foragers have trade relations with farmers. Some of the theorists who advocate this "revisionist" critique imply that, because the "pure hunter-gatherer" disappeared not long after colonial (or even agricultural) contact began, nothing meaningful can be learned about prehistoric hunter-gatherers from studies of modern ones (Kelly, 24–29; see Wilmsen ) Lee and Guenther have rejected most of

8505-509: The last 200 years. Since then, dogs have undergone rapid phenotypic change and have been subjected to artificial selection by humans. The skull, body, and limb proportions between breeds display more phenotypic diversity than can be found within the entire order of carnivores . These breeds possess distinct traits related to morphology, which include body size, skull shape, tail phenotype, fur type, and colour. As such, humans have long used dogs for their desirable traits to complete or fulfill

8610-449: The later stages of the dog's pregnancy, nesting behaviour may occur. Puppies are born with a protective fetal membrane that the mother usually removes shortly after birth. Dogs can have the maternal instincts to start grooming their puppies, consume their puppies' feces, and protect their puppies, likely due to their hormonal state. While male-parent dogs can show more disinterested behaviour toward their own puppies, most can play with

8715-579: The location of mating partners, potential stressors, resources, etc. Dogs also have an acute sense of hearing up to four times greater than that of humans. They can pick up the slightest sounds from about 400 m (1,300 ft) compared to 90 m (300 ft) for humans. Dogs have stiff, deeply embedded hairs known as whiskers that sense atmospheric changes, vibrations, and objects not visible in low light conditions. The lower most part of whiskers hold more receptor cells than other hair types, which help in alerting dogs of objects that could collide with

8820-472: The most common cause of pesticide poisoning. Metaldehyde a common pesticide for snails and slugs typically causes severe outcomes when ingested by dogs. Neoplasia is the most common cause of death for dogs. Other common causes of death are heart and renal failure . Their pathology is similar to that of humans, as is their response to treatment and their outcomes. Genes found in humans to be responsible for disorders are investigated in dogs as being

8925-440: The most densely forested areas. Unlike their Bronze and Iron Age counterparts, Neolithic societies could not establish themselves in dense forests, and Copper Age societies had only limited success. In addition to men, a single study found that women engage in hunting in 79% of modern hunter-gatherer societies. However, an attempted verification of this study found "that multiple methodological failures all bias their results in

9030-497: The nose, ears, and jaw. Whiskers likely also facilitate the movement of food towards the mouth. The coats of domestic dogs are of two varieties: "double" being common in dogs (as well as wolves) originating from colder climates, made up of a coarse guard hair and a soft down hair , or "single", with the topcoat only. Breeds may have an occasional "blaze", stripe, or "star" of white fur on their chest or underside. Premature graying can occur in dogs as early as one year of age; this

9135-661: The occurrence of artificial selection and the subsequent divergence of behavior and anatomical features. These genes have been shown to affect the catecholamine synthesis pathway, with the majority of the genes affecting the fight-or-flight response (i.e., selection for tameness ) and emotional processing. Compared to their wolf counterparts, dogs tend to be less timid and less aggressive, though some of these genes have been associated with aggression in certain dog breeds. Traits of high sociability and lack of fear in dogs may include genetic modifications related to Williams-Beuren syndrome in humans, which cause hypersociability at

9240-423: The only statistically significant factor to impact hunter-gatherer tool kits. Using temperature as a proxy for risk, Collard et al.'s results suggest that environments with extreme temperatures pose a threat to hunter-gatherer systems significant enough to warrant increased variability of tools. These results support Torrence's (1989) theory that the risk of failure is indeed the most important factor in determining

9345-445: The population in developing countries largely consists of feral and community dogs. Gray wolf (domestic dog) [REDACTED] Coyote [REDACTED] African wolf [REDACTED] Ethiopian wolf [REDACTED] Golden jackal [REDACTED] Dhole [REDACTED] African wild dog [REDACTED] Side-striped jackal [REDACTED] Black-backed jackal [REDACTED] Dogs are domesticated members of

9450-674: The researchers agreed that hunter-gatherers were more egalitarian than modern societies, prior characterisations of them living in a state of egalitarian primitive communism were inaccurate and misleading. This study, however, exclusively examined modern hunter-gatherer communities, offering limited insight into the exact nature of social structures that existed prior to the Neolithic Revolution. Alain Testart and others have said that anthropologists should be careful when using research on current hunter-gatherer societies to determine

9555-407: The right side". Dogs can injure themselves by wagging their tails forcefully; this condition is called kennel tail , happy tail , bleeding tail , or splitting tail . In some hunting dogs , the tail is traditionally docked to avoid injuries. Some dogs can be born without tails because of a DNA variant in the T gene , which can also result in a congenitally short (bobtail) tail. Tail docking

9660-452: The same camp. The systems of kinship and descent among human hunter-gatherers were relatively flexible, although there is evidence that early human kinship in general tended to be matrilineal . The conventional assumption has been that women did most of the gathering, while men concentrated on big game hunting. An illustrative account is Megan Biesele's study of the southern African Ju/'hoan, 'Women Like Meat'. A recent study suggests that

9765-646: The same direction...their analysis does not contradict the wide body of empirical evidence for gendered divisions of labor in foraging societies". Only a few contemporary societies of uncontacted people are still classified as hunter-gatherers, and many supplement their foraging activity with horticulture or pastoralism . Hunting and gathering was presumably the subsistence strategy employed by human societies beginning some 1.8 million years ago, by Homo erectus , and from its appearance some 200,000 years ago by Homo sapiens . Prehistoric hunter-gatherers lived in groups that consisted of several families resulting in

9870-463: The same number of bones (with the exception of the tail), powerful jaws that house around 42 teeth, and well-developed senses of smell, hearing, and sight. Compared to humans, dogs have an inferior visual acuity , a superior sense of smell, and a relatively large olfactory cortex . They perform many roles for humans, such as hunting , herding , pulling loads , protection , companionship , therapy , aiding disabled people , and assisting police and

9975-509: The sexual division of labor was the fundamental organizational innovation that gave Homo sapiens the edge over the Neanderthals, allowing our ancestors to migrate from Africa and spread across the globe. A 1986 study found most hunter-gatherers have a symbolically structured sexual division of labor. However, it is true that in a small minority of cases, women hunted the same kind of quarry as men, sometimes doing so alongside men. Among

10080-403: The structure of hunter-gatherer toolkits. One way to divide hunter-gatherer groups is by their return systems. James Woodburn uses the categories "immediate return" hunter-gatherers for egalitarianism and "delayed return" for nonegalitarian. Immediate return foragers consume their food within a day or two after they procure it. Delayed return foragers store the surplus food. Hunting-gathering

10185-765: The structure of societies in the paleolithic era, emphasising cross-cultural influences, progress and development that such societies have undergone in the past 10,000 years. As one moves away from the equator , the importance of plant food decreases and the importance of aquatic food increases. In cold and heavily forested environments, edible plant foods and large game are less abundant and hunter-gatherers may turn to aquatic resources to compensate. Hunter-gatherers in cold climates also rely more on stored food than those in warm climates. However, aquatic resources tend to be costly, requiring boats and fishing technology, and this may have impeded their intensive use in prehistory. Marine food probably did not start becoming prominent in

10290-644: The tail's position and movement. Dogs can have a violet gland (or supracaudal gland) characterized by sebaceous glands on the dorsal surface of their tails; in some breeds, it may be vestigial or absent. The enlargement of the violet gland in the tail, which can create a bald spot from hair loss , can be caused by Cushing's disease or an excess of sebum from androgens in the sebaceous glands. A study suggests that dogs show asymmetric tail-wagging responses to different emotive stimuli. "Stimuli that could be expected to elicit approach tendencies seem to be associated with [a] higher amplitude of tail-wagging movements to

10395-847: The viability of hunting and gathering in the 21st century. One such group is the Pila Nguru (Spinifex people) of Western Australia , whose land in the Great Victoria Desert has proved unsuitable for European agriculture (and even pastoralism). Another are the Sentinelese of the Andaman Islands in the Indian Ocean , who live on North Sentinel Island and to date have maintained their independent existence, repelling attempts to engage with and contact them. The Savanna Pumé of Venezuela also live in an area that

10500-427: The world. Across Western Eurasia, it was not until approximately 4,000 BC that farming and metallurgical societies completely replaced hunter-gatherers. These technologically advanced societies expanded faster in areas with less forest, pushing hunter-gatherers into denser woodlands. Only the middle-late Bronze Age and Iron Age societies were able to fully replace hunter-gatherers in their final stronghold located in

10605-519: The young pups as they would with other dogs or humans. A female dog may abandon or attack her puppies or her male partner dog if she is stressed or in pain. Hunter-gatherer Hunting and gathering was humanity's original and most enduring successful competitive adaptation in the natural world, occupying at least 90 percent of human history . Following the invention of agriculture , hunter-gatherers who did not change were displaced or conquered by farming or pastoralist groups in most parts of

10710-613: Was not a local wolf. The dog was dated to 14,223 years ago and was found buried along with a man and a woman, all three having been sprayed with red hematite powder and buried under large, thick basalt blocks. The dog had died of canine distemper . This timing indicates that the dog was the first species to be domesticated in the time of hunter-gatherers , which predates agriculture. Earlier remains dating back to 30,000 years ago have been described as Paleolithic dogs , but their status as dogs or wolves remains debated because considerable morphological diversity existed among wolves during

10815-429: Was one of several central characteristics of nomadic hunting and gathering societies because mobility requires minimization of material possessions throughout a population. Therefore, no surplus of resources can be accumulated by any single member. Other characteristics Lee and DeVore proposed were flux in territorial boundaries as well as in demographic composition. At the same conference, Marshall Sahlins presented

10920-465: Was the common human mode of subsistence throughout the Paleolithic , but the observation of current-day hunters and gatherers does not necessarily reflect Paleolithic societies; the hunter-gatherer cultures examined today have had much contact with modern civilization and do not represent "pristine" conditions found in uncontacted peoples . The transition from hunting and gathering to agriculture

11025-449: Was the first species to be domesticated by humans , over 14,000 years ago and before the development of agriculture . Experts estimate that due to their long association with humans, dogs have gained the ability to thrive on a starch -rich diet that would be inadequate for other canids . Dogs have been bred for desired behaviors, sensory capabilities, and physical attributes. Dog breeds vary widely in shape, size, and color. They have

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