101-570: A police dog , also known as a K-9 , is a dog that is trained to assist police and other law enforcement officers . Their duties may include searching for drugs and explosives , locating missing people , finding crime scene evidence, protecting officers and other people, and attacking suspects who flee from officers. The breeds most commonly used by law enforcement are the German Shepherd , Belgian Malinois , Bloodhound , Dutch Shepherd , and Labrador Retriever . In recent years,
202-404: 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
303-468: 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
404-404: A K-9 Unit, with a specific handler, and must remember several verbal cues and hand gestures. Initial training for a police dog typically takes between eight months and a year, depending on where and how they are trained, and for what purpose. Police dogs often regularly take training programs with their assigned handler to reinforce their training. In many countries, intentionally injuring or killing
505-471: 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
606-507: A charcoal-coloured face and extremities. The Tervuren variety is long-haired like the Groenendael; its double coat is typically fawn in colour with black overlay and with black extremities, although grey with black is known. It has a ruff of long hair around the neck and feathering on the legs. Belgian Shepherds are known to be highly intelligent, alert and sensitive; they are typically highly trainable, vigilant and hard-working with
707-644: 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
808-494: A dog to be considered for a police department, it must first pass a basic obedience training course. They must be able to obey the commands of their handler without hesitation. This allows the officer to have complete control over how much force the dog should use against a suspect. Dogs trained in Europe are usually given commands in the country's native language. Dogs are initially trained with this language for basic behavior, so, it
909-636: 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
1010-460: A long history of being used by Belgian police as well as military forces, serving for Belgian armed forces in both World Wars, as well as US Army since then. In the twenty-first century it is in use by a number of armed forces worldwide in a variety of roles. The Belgian Shepherd descends from the same common type of herding dog as similar Western European breeds such as the Bouvier des Ardennes ,
1111-766: A majority-Black city of 220,000 residents, averages more than double that of the next-ranked city, Indianapolis , and nearly one-third of the police dog bites are inflicted on teenage men, most of whom are Black. Medical researchers found that police dog attacks are "more like shark attacks than nips from a family pet" due to the aggressive training police dogs undergo. Many people bitten were not violent and were not suspected of crimes. Police officers are often shielded from liability, and federal civil rights laws don't typically cover bystanders who are bitten by mistake. Even when victims can bring cases, lawyers say they struggle because jurors tend to love police dogs. Dog The dog ( Canis familiaris or Canis lupus familiaris )
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#17327801314331212-499: 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
1313-401: 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
1414-644: A police dog is a criminal offense. Dogs have been used in law enforcement since the Middle Ages . Wealth and money was then tithed in the villages for the upkeep of the parish constable 's bloodhounds that were used for hunting down outlaws . The first recorded use of police dogs were in the early 14th century in St. Malo , France , where dogs were used to guard docks and piers . By the late 14th century, bloodhounds were used in Scotland , known as "Slough dogs" –
1515-592: A police search to find them. It was in Continental Europe that dogs were first used on a large scale. Police in Paris began using dogs against roaming criminal gangs at night, but it was the police department in Ghent , Belgium that introduced the first organized police dog service program in 1899. These methods soon spread to Austria-Hungary and Germany ; in the latter the first scientific developments in
1616-494: 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
1717-553: A strong guarding instinct making them protective of property and family, and very well suited for service with security services. The Groenendael and Tervueren varieties have a reputation for occasionally being snappy, making them less suitable as companion dogs for children; the Laekenois, whilst considered very good with children, can occasionally be troublesome with other dogs. The Belgian Shepherd responds well to training, and ideally requires training from an early age. The breed
1818-458: 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
1919-536: 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
2020-512: 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 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
2121-698: 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
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#17327801314332222-548: 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
2323-474: 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 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
2424-405: 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,
2525-653: 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
2626-399: Is a very lengthy process since it begins with the training of the canine handler. The canine handlers go through a long process of training to ensure that they will train the dog to the best of its ability. First, the canine handler has to complete the requisite police academy training and one to two years of patrol experience before becoming eligible to transfer to a specialty canine unit. This
2727-432: 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
2828-468: 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
2929-418: Is because the experience as an officer allows prospective canine officers to gain valuable experience in law enforcement. However, having dog knowledge and training outside of the police academy is considered to be an asset, this could be dog obedience, crowd control, communicating effectively with animals and being approachable and personable since having a dog will draw attention from surrounding citizens. For
3030-411: Is bred in four distinct varieties based on coat type and colour: the long-haired black Groenendael ; the rough-haired fawn Laekenois ; the short-haired fawn Malinois , and the long-haired fawn Tervuren . The American Kennel Club considers the four varieties to be separate breeds. The breed descends from a common type of shepherd dog found throughout Western Europe that includes such modern breeds as
3131-700: 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,
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3232-423: 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
3333-629: Is easier for the officer to learn new words/commands, rather than retraining the dog to new commands. This is contrary to the popular belief that police dogs are trained in a different language so that a suspect cannot command the dog against the officer. Dogs used in law enforcement are trained to either be "single purpose" or "dual purpose". Single-purpose dogs are used primarily for backup, personal protection, and tracking. Dual-purpose dogs, however, are more typical. Dual-purpose dogs do everything that single-purpose dogs do, and also detect either explosives or narcotics . Dogs can only be trained for one or
3434-461: Is long feathering on the rear of the legs, they have an abundant mane on their neck and chest, particularly long hair on the rear of their thighs and a bushy tail that forms a plume. Short-haired dogs have particularly short hair on the faces, ears and lower portion of their legs, short over the rest of the body and slightly longer on the neck and tail. Rough-haired dogs have a coat that is rough, dry and approximately 6 cm (2.4 in) long over
3535-447: 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, 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
3636-401: Is muscular but not overly heavy; body length from shoulder to haunches is approximately the same as the height at the withers, proportionally slightly longer in bitches; the topline is straight and the belly neither low-slung nor overly high like that of a sighthound . The chest is deep but not overly broad; the neck is muscular, widening at the shoulders with a slight arch at the nape; the tail
3737-461: 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
3838-666: 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
3939-437: Is rough-haired, its coat is fawn in colour with discreet black overlay and is harsh, dry and normally slightly tangled in appearance; it has a bristled, feathered muzzle and limited feathering on the legs and tail. According to the breed standard, black overlay means the tips of the hair are black but not in patches or stripes such as brindle . The Malinois variety is short-haired, it is fawn in colour with black overlay, with
4040-753: 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
4141-467: Is strong and of medium length, and curves upwards slightly at the level of the knee. The forelegs are straight and well-boned, the hind legs muscular and powerful; the legs are not overly heavy. The four varieties vary principally in their coat types and colours. The breed standard describes three coat varieties; long-haired, short-haired and rough-haired. Long-haired dogs have a long, smooth coat with short hair on their faces, ears and legs although there
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4242-442: 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
4343-404: 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
4444-679: Is very active – particularly the Malinois, which may reflect its continued breeding for security roles. While Belgian Shepherds of all coat types require ample exercise, the breed adapts well to living indoors. The Belgian Shepherd, particularly in the Groenendael, Laekenois and Tervuren varieties, is predominantly kept as a pet or companion dog ; all of the varieties may compete in obedience competitions and Schutzhund . The dogs are versatile and are often trained for use as assistance dogs , detection dogs , guard dogs , guide dogs , police dogs , and search and rescue dogs . In recent times,
4545-837: 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
4646-471: The Bouvier des Ardennes , Dutch Shepherd and German Shepherd , and was a common sight in the service of Belgian shepherds for centuries. At the end of the nineteenth century a breed club was formed and attempts were made to standardise the breed. Its historical role was as a herding dog. It is also commonly kept as a companion dog , or used as an assistance dog , detection dog , guard dog , guide dog , police dog or search and rescue dog . It has
4747-604: The Dutch Shepherd and the German Shepherd , and for centuries was used by Belgian shepherds for this task. Unlike in other European countries where, throughout the nineteenth century, shepherd breeds were standardised and breeders made efforts to perpetuate their breeds, by the end of the century the Belgian Shepherd was becoming obsolete and was at danger of extinction. In 1891, the Club de Chien Berger Belge
4848-438: 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
4949-638: The Mechelen region (called Malines in French), where it was the predominant coat type used by the local shepherds. The Laekenois variety has always been the rarest; they take their name from the Château de Laeken , a residence of the Belgian royal family . The Laekenois was a favourite of Queen Marie Henriette , who frequently watched them in the service of the shepherds who grazed the royal domains around
5050-985: The North Eastern Railway Police were among the first to use police dogs in 1908 to put a stop to theft from the docks in Hull . By 1910, railway police forces were experimenting with other breeds such as Belgian Malinois, Labrador Retrievers , and German shepherds. Popular dog breeds used by law enforcement include the Airedale terrier , Akita , Groenendael , Tervueren , Malinois dog , Bernese Mountain Dog , Bloodhound , Border Collie , Boxer , Bouvier des Flandres , Briard , Cane Corso , Bullmastiff , Croatian Sheepdog , Doberman Pinscher , German Shepherd , German Shorthaired Pointer , Golden Retriever , Labrador Retriever , Rottweiler and English Springer Spaniel , Dogo Argentino . Training of police dogs
5151-819: The United States Secret Service , the Israel Defense Forces ' Oketz Unit , the Australian Defence Force , and the anti-poaching canine unit at the Kruger National Park . A UK study for a life expectancy of 12 years for the Malinois and 13.8 years for the Tervuren compared to an average of 12.7 for purebreeds and 12 for crossbreeds . The Société Royale Saint-Hubert recommends all four varieties are tested for hip and elbow dysplasia and that
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#17327801314335252-444: The breed standard states the ideal height is 62 cm (24 in) for dogs and 58 cm (23 in) for bitches. The breed has a long, slender head with triangular, erect ears that are rounded at the base, and a long, narrow but balanced muzzle. According to the breed standard a dog that stands 62 centimetres at the withers should have a head 25 cm (9.8 in) long and a muzzle approximately half that length. The body
5353-406: 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
5454-1166: 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
5555-473: 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,
5656-537: The serial killer Jack the Ripper had earned him much vilification from the press, including being denounced for not using bloodhounds to track the killer. He soon had two bloodhounds trained for the performance of a simple tracking test from the scene of another of the killer's crimes. The results were far from satisfactory, with one of the hounds biting the Commissioner and both dogs later running off, requiring
5757-466: The Belgian Malinois has become the leading choice for police and military work due to their intense drive, focus, agility, and smaller size, though German Shepherds remain the breed most associated with law enforcement. Police dogs are used on a federal and local level for law enforcement purposes in many parts of the world. They are often assigned to what in some nations is referred to as
5858-536: The Château de Groenendael. Rose owned a long-haired, black Belgian Shepherd bitch called "Petite", liking her look so much he spent over a year searching for a suitable mate, eventually finding a dog named "Piccard D'Uccle" who belonged to a shepherd called Mr Beernaert. These two are considered the foundation stock of the variety. Their finest progeny were called "Duc de Groenendael" and "Barroness" who were mated widely to Belgian Shepherds of different appearances with
5959-621: The Groenendael. The Groenendael remains the most numerous variety, followed by the Tervuren. The number of Malinois is growing, while the Laekenois remains comparatively rare. Most of the world's national kennel clubs including the Société Royale Saint-Hubert, as well as the Fédération Cynologique Internationale , recognise the Belgian Shepherd as a single breed with four distinct varieties. The American Kennel Club recognises
6060-616: The Laekenois has been employed by the Belgian Army in a variety of roles (in addition to the longstanding use of the Malinois), and the Tervuren is frequently used by government organisations as a drug detection dog. The Malinois in particular has become increasingly popular with customs, military, border guard and police forces; organisations that utilise the Malinois include the United States Armed Forces ,
6161-582: 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
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#17327801314336262-516: The U.S. in the following years; to this day in the US the name Belgian Shepherd or Belgian Sheepdog is commonly used to refer to the Groenendael. The Malinois variety was said to be the first variety to breed true to type and initially they became so well-known in Belgium that at one time the other varieties were collectively called "other-than-Malinois", it was the Malinois that the other varieties were gauged against. The variety takes its name from
6363-460: 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 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 ,
6464-553: The black progeny retained. Initially Rose had wanted to name the variety the "Rose", but it was deemed this could cause confusion given their black colour so they were instead named after his château, Groenendael. During the First World War, Groenendaels were used by the Belgian Army to locate wounded soldiers and carry messages. Their bravery was recognised by U.S. soldiers during the war and examples were imported to
6565-403: The body, they have shorter hair on the top of the muzzle and legs and, unlike the other coat types, they have long hair on the face and muzzle. The Groenendael variety is long-haired, it has a solid black double coat, the outer coat is straight and particularly long around the shoulders, neck and chest; they have short hair on the face, and well feathered legs and tail. The Laekenois variety
6666-399: 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
6767-407: 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
6868-449: The château; this patronage contributed to their popularity at the time. In addition to being used as herding dogs, rough-haired Belgian Shepherds were traditionally used as guard dogs in the regions surrounding Boom , guarding valuable linens put out to bleach in the sun. The Tervuren variety is believed to have been created when a brewer, M. Corbeel, bred his fawn long-haired Belgian Shepherd pair "Tom" and "Poes", one of their progeny
6969-835: 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
7070-559: The crime on their own, and as a result, private associations were formed to help combat crime. Night watchmen were employed to guard premises, and were provided with firearms and dogs to protect themselves from criminals. One of the first attempts to use dogs in policing was in 1889 by the Commissioner of the Metropolitan Police of London, Sir Charles Warren . Warren's repeated failures at identifying and apprehending
7171-537: 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,
7272-489: 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
7373-721: The dogs were also allowed to be adopted by their original handler. In many countries, police dogs killed in the line of duty receive the same honors as their human partners. A 2020 investigation coordinated by the Marshall Project found evidence of widespread deployment of police dogs in the U.S. as disproportionate force and disproportionately against people of color. A series of 13 linked reports found more than 150 cases from 2015 to 2020 of K-9 officers improperly using dogs as weapons to catch, bite, and injure people. The rate of police K-9 bites in Baton Rouge, Louisiana ,
7474-597: 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
7575-604: 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
7676-533: 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,
7777-541: The field took place with experiments in dog breeding and training. The German police selected the German Shepherd Dog as the ideal breed for police work and opened up the first dog training school in 1920 in Greenheide. In later years, many Belgian Malinois dogs were added to the unit. The dogs were systematically trained in obedience to their officers and tracking and attacking criminals. In Britain,
7878-518: The first year of their life and retired before they become unable to perform, the working life of a dog is 6–9 years. However, when police dogs retire in some countries they may have the chance to receive a pension plan for their contribution to policing. In 2013, a pension scheme for police dogs in Nottinghamshire , England was introduced, wherein the police force offered £805 over the span of three years to cover any additional medical costs;
7979-449: 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
8080-691: The four varieties as separate breeds, leading to some difficulties for American breeders who breed from imported European stock: European Groenendaels in particular can whelp Tervuren-coloured pups; in most of the world these can be registered as Tervurens, whereas in the United States they would be disqualified from registration. The Belgian Shepherd is a medium-sized athletic breed with a body built for endurance. Dogs typically stand between 56 and 66 cm (22 and 26 in), with bitches being on average 4 cm (2 in) shorter than dogs. They usually weigh between 20 and 30 kg (45 and 65 lb);
8181-509: 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
8282-458: 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
8383-580: 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
8484-509: 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
8585-449: 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
8686-579: 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
8787-472: 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
8888-497: 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
8989-661: 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
9090-730: The other because the dog cannot communicate to the officer if it found explosives or narcotics. When a narcotics dog in the United States indicates to the officer that it found something, the officer has probable cause to search whatever the dog alerted on (i.e. bag or vehicle) without a warrant, in most states. In suspect apprehension, having a loud barking dog is helpful and can result in suspects surrendering without delay. Police dogs can be specialized to perform in specific areas. Police dogs are retired if they become injured to an extent where they will not recover completely, pregnant or raising puppies , or are too old or sick to continue working. Since many dogs are raised in working environments for
9191-508: The process of standardising them into distinct varieties. Classifying them as a single breed, initially Professor Reul's team divided the breed into six different varieties based on coat type and colour; between 1892 when the first breed standard was drafted and 1956, as few as two varieties and as many as eight were recognised by either the Club de Chien Berger Belge or the Société Royale Saint-Hubert . In 1905 it
9292-407: 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
9393-644: 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
9494-553: The word "Sleuth", (meaning detective ) was derived from this. Between the 12th and 20th centuries, police dogs on the British Isles and European continent were primarily used for their tracking abilities. The rapid urbanization of England and France in the 19th century increased public concern regarding growing lawlessness. In London , the existing law enforcement, the Bow Street Runners , struggled to contain
9595-618: 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 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
9696-523: 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. Belgian Shepherd The Belgian Shepherd ( Dutch : Belgische Herder ), also known as the Belgian Sheepdog ( Dutch : Belgische Herdershond ) or the Chien de Berger Belge , is a Belgian breed of herding dog of medium size. It
9797-442: Was a long-haired fawn bitch named "Miss" who was purchased by a M. Deanhieux. Miss was bred with Duc de Groenendael, the foundation sire of the Groenendael variety, and the fawn progeny became the Tervuren variety who take their name from the region of Tervuren . The Tervuren variety is considered particularly robust and healthy and in Europe a number of breeders use them to reinforce the bloodlines of other varieties, particularly
9898-414: Was decided once again that matings between dogs of the different varieties was to be encouraged, and through careful breeding the Belgian Shepherd recovered in numbers. In 1956 the current breed standard was adopted and it specified the four varieties known today; the Groenendael, Laekenois, Malinois and Tervuren. The Groenendael variety is believed to have been created in 1885 by Nicholas Rose, owner of
9999-482: Was decided that interbreeding between the different varieties should be forbidden, but the disruptions caused by the First World War resulted in a decline in breed numbers, so in 1920 it was decided matings between the varieties should be allowed in order to preserve the breed and avoid issues resulting from inbreeding. The Second World War once again threatened the viability of the breed and in late 1945, it
10100-500: Was formed with the purpose of saving the type and a team led by Professor Adolphe Reul of the Cureghem Veterinary School conducted a field survey of the type. As the Belgian Shepherd had for centuries been bred for working ability with little consideration given to form, Professor Reul found the type to vary greatly in appearance. As a part of their work, Professor Reul's team assembled 117 specimens and began
10201-613: 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
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