Dog

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Dog
Temporal range: 0.0142–0 
Ma
↓
 Late Pleistocene (14,200 years ago) to present[1]
Domesticated
Scientific classification Edit this classification
Domain: Eukaryota
Kingdom: Animalia
Phylum: Chordata
Class: Mammalia
Order: Carnivora
Family: Canidae
Genus: Canis
Species:
C. familiaris
Binomial name
Canis familiaris
Synonyms[3]
List
  • C. aegyptius Linnaeus, 1758
  • C. alco C. E. H. Smith, 1839,
  • C. americanus Gmelin, 1792
  • C. anglicus Gmelin, 1792
  • C. antarcticus Gmelin, 1792
  • C. aprinus Gmelin, 1792
  • C. aquaticus Linnaeus, 1758
  • C. aquatilis Gmelin, 1792
  • C. avicularis Gmelin, 1792
  • C. borealis C. E. H. Smith, 1839
  • C. brevipilis Gmelin, 1792
  • C. cursorius Gmelin, 1792
  • C. domesticus Linnaeus, 1758
  • C. extrarius Gmelin, 1792
  • C. ferus C. E. H. Smith, 1839
  • C. fricator Gmelin, 1792
  • C. fricatrix Linnaeus, 1758
  • C. fuillus Gmelin, 1792
  • C. gallicus Gmelin, 1792
  • C. glaucus C. E. H. Smith, 1839
  • C. graius Linnaeus, 1758
  • C. grajus Gmelin, 1792
  • C. hagenbecki Krumbiegel, 1950
  • C. haitensis C. E. H. Smith, 1839
  • C. hibernicus Gmelin, 1792
  • C. hirsutus Gmelin, 1792
  • C. hybridus Gmelin, 1792
  • C. islandicus Gmelin, 1792
  • C. italicus Gmelin, 1792
  • C. laniarius Gmelin, 1792
  • C. leoninus Gmelin, 1792
  • C. leporarius C. E. H. Smith, 1839
  • C. lupus familiaris Linnaeus,1758
  • C. major Gmelin, 1792
  • C. mastinus Linnaeus, 1758
  • C. melitacus Gmelin, 1792
  • C. melitaeus Linnaeus, 1758
  • C. minor Gmelin, 1792
  • C. molossus Gmelin, 1792
  • C. mustelinus Linnaeus, 1758
  • C. obesus Gmelin, 1792
  • C. orientalis Gmelin, 1792
  • C. pacificus C. E. H. Smith, 1839
  • C. plancus Gmelin, 1792
  • C. pomeranus Gmelin, 1792
  • C. sagaces C. E. H. Smith, 1839
  • C. sanguinarius C. E. H. Smith, 1839
  • C. sagax Linnaeus, 1758
  • C. scoticus Gmelin, 1792
  • C. sibiricus Gmelin, 1792
  • C. suillus C. E. H. Smith, 1839
  • C. terraenovae C. E. H. Smith, 1839
  • C. terrarius C. E. H. Smith, 1839
  • C. turcicus Gmelin, 1792
  • C. urcani C. E. H. Smith, 1839
  • C. variegatus Gmelin, 1792
  • C. venaticus Gmelin, 1792
  • C. vertegus Gmelin, 1792

The dog (Canis familiaris or Canis lupus familiaris) is a

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. 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.

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 is more likely when entering a new environment. Over the millennia, dogs have 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 the world. The dog is the most popular pet in the United States, present in 34–40% of households. Developed countries make up approximately 20% of the global dog population, while around 75% of dogs are estimated to be from developing countries, mainly in the form of feral and community dogs.

Taxonomy

Further information: Canis lupus dingo § Taxonomic debate – the domestic dog, dingo, and New Guinea singing dog
Canine phylogeny with ages of divergence

Gray wolf (domestic dog)

Coyote

1.10 mya

African wolf

1.32 mya

Ethiopian wolf

1.62 mya

Golden jackal

1.92 mya

Dhole

2.74 mya

African wild dog

3.06 mya
2.62 mya
3.50 mya
Cladogram and divergence of the gray wolf (including the domestic dog) among its closest extant relatives[4]

Dogs are domesticated members of the family

geographic isolation and feralization of dogs in Oceania over 8,000 years ago.[11][12]

Dogs, wolves, and

junior synonym) for the dingo. This classification was informed by a 1999 mitochondrial DNA study.[3]

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.

feral Canis familiaris. Therefore, it did not assess them for the IUCN Red List of threatened species.[17]

Domestication

Main article: Domestication of the dog
Wolves (left) were domesticated by humans into dogs (right)

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 was not a local wolf.[18] 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.[19] This timing indicates that the dog was the first species to be domesticated[20][21] in the time of hunter-gatherers,[22] which predates agriculture.[1] Earlier remains dating back to 30,000 years ago have been described as Paleolithic dogs, but their status as dogs or wolves remains debated[23] because considerable morphological diversity existed among wolves during the Late Pleistocene.[1]

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,[24][22] while others have suggested that dogs are more closely related to modern Eurasian wolves than to American wolves.[25]

The dog is a domestic animal that likely travelled a

ancient North Siberians, then later dispersed eastward into the Americas and westward across Eurasia,[18] with dogs likely accompanying the first humans to inhabit the Americas.[18] Some studies have suggested that the extinct Japanese wolf is closely related to the ancestor of domestic dogs.[25]

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

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, 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.[28]

Breeds

Main article: Dog breed
Further information:
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.[21] As such, humans have long used dogs for their desirable traits to complete or fulfill a certain work or role. Their behavioural traits include guarding, herding, hunting,[21] retrieving, and scent detection. Their personality traits include hypersocial behavior, boldness, and aggression.[21] Present-day dogs are dispersed around the world.[27] An example of this dispersal is the numerous modern breeds of European lineage during the Victorian era.[22]

Anatomy and physiology

Main article: Dog anatomy

Size and skeleton

A lateral view of a dog skeleton

Dogs are extremely variable in size, ranging from one of the largest breeds, 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).[30][31] 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.[32][33] The dog's skeleton 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.[32][33][34]

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

corgis.[33] Most dogs naturally have 26 vertebrae in their tails, but some with naturally short tails have as few as three.[32]

Skulls of different breeds, from left to right: Pug; Boxer; Rottweiler; Wolf; Collie; Standard Poodle.

The dog's skull has identical components regardless of breed type, but there is significant

carnassial teeth to cut food into bite-sized chunks, more especially meat.[36]

Senses

Further information: Dog anatomy § Senses
The left half of the image shows the estimated difference in a dog's vision.

Dogs' senses include vision, hearing, smell, taste, touch, and magnetoreception. One study suggests that dogs can feel small variations in Earth's magnetic field.[37] Dogs prefer to defecate with their spines aligned in a north–south position in calm magnetic field conditions.[38]

Dogs' vision is dichromatic; their visual world consists of yellows, blues, and grays.[39] They have difficulty differentiating between red and green,[40] 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 the breed, which can have different retina configurations.[41][42] The fovea centralis area of the eye is attached to a nerve fiber, and is the most sensitive to photons.[43] 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.[44]

While the human brain 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.[45] This sense of smell is the most prominent sense of the species; it detects chemical changes in the environment, allowing dogs to pinpoint the location of mating partners, potential stressors, resources, etc.[46] 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.[47]

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 the nose, ears, and jaw. Whiskers likely also facilitate the movement of food towards the mouth.[48]

Coat

Main article:
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.[49] Premature graying can occur in dogs as early as one year of age; this is associated with impulsive behaviors, anxiety behaviors, and fear of unfamiliar noise, people, or animals.[50] 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".[36]

Dewclaw

A dog's dewclaw is the fifth digit in its forelimb and hind legs. Dewclaws on the forelimbs are attached by bone and ligament, while the dewclaws on the hind legs are attached only by skin. Most dogs are not 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.[51][52]

Tail

A dog's tail 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.[53] 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 the tail's position and movement.[54] 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.[55]

A black Standard Schnauzer with a docked tail

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 the right side".[56][57] Dogs can injure themselves by wagging their tails forcefully; this condition is called kennel tail, happy tail, bleeding tail, or splitting tail.[58] 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.[59] Tail docking is opposed by many veterinary and animal welfare organisations such as the American Veterinary Medical Association[60] and the British Veterinary Association.[61] Evidence from veterinary practices and questionnaires showed that around 500 dogs would need to have their tail docked to prevent one injury.[62]

Health

Main article: Dog health

Numerous disorders have been known to affect dogs. Some are

neoplasia.[63]

Common dog parasites are

canine distemper virus, canine parvovirus, leptospirosis, canine influenza, and canine coronavirus. All of these conditions have vaccines available.[66]

Dogs are the companion animal most frequently reported for exposure to

rodenticides.[67] 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, onions, etc.). Pyrethrin insecticides were the most common cause of pesticide poisoning. Metaldehyde, a common pesticide for snails and slugs, typically causes severe outcomes when ingested by dogs.[68]

renal failure.[71] 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 the cause and vice versa.[27][72]

Lifespan

Further information: Aging in dogs

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.[73][74] 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.[73]

In 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.[75] Other studies also show that fully mongrel dogs live about a year longer on average than dogs with pedigrees.[76] Furthermore, small dogs with longer muzzles have been shown to have higher lifespans than larger medium-sized dogs with much more depressed muzzles.[77] For free-ranging dogs, less than 1 in 5 reach sexual maturity,[78] and the median life expectancy for feral dogs is less than half of dogs living with humans.[79]

Reproduction

Main article: Canine reproduction
Two dogs tied after mating

In domestic dogs,

fertilization,[82][86] with an average of 63 days, although the length of gestation can vary. An average litter consists of about six puppies.[87]

Neutering

diabetes mellitus in either sex.[92]

Neutering is the most common surgical procedure in dogs less than a year old in the US and is seen as a control method for overpopulation. Neutering often occurs as early as 6–14 weeks in shelters in the US.[93] 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.[94][95] However, the Society for Theriogenology and the American College of Theriogenologists made a joint statement that opposes mandatory neutering; they said that the cause of overpopulation in the US is cultural.[93]

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 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.[93][96]

Inbreeding depression

See also: Inbreeding depression

A common breeding practice for pet dogs is to

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.[100]

Behavior

Main article: Dog behavior
See also: Dog intelligence
See also: Dog behavior § Behavior compared with other canids

great apes, are parallel to children's social-cognitive skills.[103] Dogs have about twice the number of neurons in their cerebral cortexes than what cats have, which suggests they could be about twice as intelligent.[104]

Most domestic animals were initially bred for the production of goods. Dogs, on the other hand, were selectively bred for desirable behavioral traits.

Williams-Beuren syndrome in humans, which cause hypersociability at the expense of problem-solving ability.[110] In a 2023 study of 58 dogs, some dogs classified as attention deficit hyperactivity disorder-like showed lower serotonin and dopamine concentrations.[111] A similar study claims that hyperactivity is more common in male and young dogs.[112] A dog can become aggressive because of trauma or abuse, fear or anxiety, territorial protection, or protecting an item it considers valuable.[113] Acute stress reactions from post-traumatic stress disorder (PTSD) seen in dogs can evolve into chronic stress.[114] Police dogs with PTSD can often refuse to work.[115]

Dog swimming over to catch a ball

Dogs have 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.[116] Puppies or dogs sometimes bury food underground. One study found that wolves outperformed dogs in finding food caches, likely due to a "difference in motivation" between wolves and dogs.[117] 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.[118] Most dogs can swim. In a study of 412 dogs, around 36.5% of the dogs could not swim; the other 63.5% were able to swim without a trainer in a swimming pool.[119] A study of 55 dogs found a correlation between swimming and 'improvement' of the hip osteoarthritis joint.[120]

Nursing

A female dog nursing her newborn puppies.

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,[121][122] and increases with litter size.[122] The dog can sometimes vomit and refuse food during child contractions.[123] In the later stages of the dog's pregnancy, nesting behaviour may occur.[124] 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.[125][126] While male-parent dogs can show more disinterested behaviour toward their own puppies,[127] most can play with the young pups as they would with other dogs or humans.[128] A female dog may abandon or attack her puppies or her male partner dog if she is stressed or in pain.[129]

Intelligence

Main article: Dog intelligence

Researchers have tested dogs' ability to perceive information, retain it as knowledge, and apply it to solve problems. Studies of two dogs suggest that dogs can learn by

Rico, a Border Collie, showed that he knew the labels of over 200 different items. He inferred the names of novel things by exclusion learning and correctly retrieved those new items after four weeks of the initial exposure. A study of another Border Collie, Chaser, documented that he had learned the names and could associate them by verbal command with over 1,000 words.[130]

One study of canine cognitive abilities found that dogs' capabilities are similar to those of

chimpanzees, or cats.[131] One study of 18 household dogs found that the dogs could not distinguish food bowls at specific locations without distinguishing cues; the study stated that this indicates a lack of spatial memory.[132] A study stated that dogs have a visual sense for number. The dogs showed a ratio-dependent activation both for numerical values from 1–3 to larger than four.[133]

Dogs demonstrate a theory of mind by engaging in deception.[134] Another experimental study showed evidence that Australian dingos can outperform domestic dogs in non-social problem-solving, indicating that domestic dogs may have lost much of their original problem-solving abilities once they joined humans.[135] Another study showed that dogs stared at humans after failing to complete an impossible version of the same task they had been trained to solve. Wolves, under the same situation, avoided staring at humans altogether.[136]

Communication

Main article: Dog communication
Dog sounds
A dog making noises and barking
Problems playing this file? See media help.

Dog communication is the transfer of information between dogs, as well as between dogs and humans.[137] Communication behaviors of dogs include eye gaze, facial expression,[138][139] vocalization, body posture (including movements of bodies and limbs), and gustatory communication (scents, pheromones, and taste). Dogs mark their territories by urinating on them, which is more likely when entering a new environment.[140][141] Both sexes of dogs may also urinate to communicate anxiety or frustration, submissiveness, or when in exciting or relaxing situations.[142] Aroused dogs can be a result of the dogs' higher cortisol levels.[143] Dogs begin socializing with other dogs by the time they reach the ages of 3 to 8 weeks, and at about 5 to 12 weeks of age, they alter their focus from dogs to humans.[144] Belly exposure in dogs can be a defensive behavior that can lead to a bite or to seek comfort.[145]

Humans communicate with dogs by using vocalization, hand signals, and body posture. With their acute sense of hearing, dogs rely on the auditory aspect of communication for understanding and responding to various cues, including the distinctive barking patterns that convey different messages. A study using functional magnetic resonance imaging (fMRI) has shown that dogs respond to both vocal and nonvocal voices using the brain's region towards the temporal pole, similar to that of humans' brains. Most dogs also looked significantly longer at the face whose expression matched the valence of vocalization.[146][147][148] A study of caudate responses shows that dogs tend to respond more positively to social rewards than to food rewards.[149]

Ecology

Population

The dog is the most widely abundant large carnivoran living in the human environment.[150][151] In 2020, the estimated global dog population was between 700 million and 1 billion.[152] In the same year, a study found the dog to be the most popular pet in the United States, as they were present in 34 out of every 100 homes.[5] About 20% of the dog population live in developed countries.[153] In the developing world, it is estimated that three-quarters of the world's dog population lives in the developing world as feral, village, or community dogs.[154] Most of these dogs live as scavengers and have never been owned by humans, with one study showing that village dogs' most common response when approached by strangers is to run away (52%) or respond aggressively (11%).[155]

Competitors

Feral and free-ranging dogs' potential to compete with other large carnivores is limited by their strong association with humans.[150] Although wolves are known to kill dogs, wolves tend to live in pairs in areas where they are highly persecuted, giving them a disadvantage when facing large dog groups.[156][157] In some instances, wolves have displayed an uncharacteristic fearlessness of humans and buildings when attacking dogs, to the extent that they have to be beaten off or killed.[158] Although the numbers of dogs killed each year are relatively low, there is still a fear among humans of wolves entering villages and farmyards to take dogs, and losses of dogs to wolves have led to demands for more liberal wolf hunting regulations.[156]

Amur river region have killed dogs in the middle of villages. They will not tolerate wolves as competitors within their territories, and the tigers could be considering dogs in the same way.[160] Striped hyenas are known to kill dogs in their range.[161] Dogs as introduced predators have affected the ecology of New Zealand, which lacked indigenous land-based mammals before human settlement.[162] Dogs have made 11 vertebrate species extinct and are identified as a 'potential threat' to at least 188 threatened species worldwide.[163] Dogs have also been linked to the extinction of 156 animal species.[164] Dogs have been documented to have killed a few birds of the endangered species, the kagu, in New Caledonia.[165]

Diet

See also: Dog food
golden retriever
gnawing on a pig's foot bone

Dogs are typically described as omnivores.[82][166][167] Compared to wolves, dogs from agricultural societies have extra copies of amylase and other genes involved in starch digestion that contribute to an increased ability to thrive on a starch-rich diet.[168] Similar to humans, some dog breeds produce amylase in their saliva and are classified as having a high-starch diet.[169] Despite being an omnivore, dogs are only able to conjugate bile acid with taurine. They must get vitamin D from their diet.[170]

Of the twenty-one amino acids common to all life forms (including selenocysteine), dogs cannot synthesize ten: arginine, histidine, isoleucine, leucine, lysine, methionine, phenylalanine, threonine, tryptophan, and valine.[171][172][173] Like cats, dogs require arginine to maintain nitrogen balance. These nutritional requirements place dogs halfway between carnivores and omnivores.[174]

Range

As a domesticated or semi-domesticated animal, the dog has notable exceptions of presence in:

Dogs were introduced to Antarctica as sled dogs. Starting practice in December 1993, dogs were later outlawed by the Protocol on Environmental Protection to the Antarctic Treaty international agreement due to the possible risk of spreading infections.[187]

Roles with humans

Main article: Human–canine bond

The

predator and scavenger.[188][189] They inherited complex behaviors, such as bite inhibition, from their wolf ancestors, which would have been pack hunters with complex body language. These sophisticated forms of social cognition and communication may account for dogs' trainability, playfulness, and ability to fit into human households and social situations,[190] and probably also their co-existence with early human hunter-gatherers.[191][192] Dogs perform many roles for people, such as hunting, herding, pulling loads, protection, assisting police and the military, companionship, and aiding disabled individuals. These roles in human society have earned them the nickname "man's best friend" in the Western world. In some cultures, however, dogs are also a source of meat.[193][194]

Pets

Siberian husky
with a human companion

The keeping of dogs as companions, particularly by elites, has a long history.[195] Pet-dog populations grew significantly after World War II as suburbanization increased.[195] In the 1980s, there have been changes in the pet dog's functions, such as the increased role of dogs in the emotional support of their human guardians.[196][197][198] Within the second half of the 20th century, more and more dog owners considered their animal to be a part of the family. This major social status shift allowed the dog to conform to social expectations of personality and behavior.[198] The second has been the broadening of the concepts of family and the home to include dogs-as-dogs within everyday routines and practices.[198]

Products such as dog-training books, classes, and television programs target dog owners.

dog yoga.[199]

According to statistics published by the American Pet Products Manufacturers Association in the National Pet Owner Survey in 2009–2010, an estimated 77.5 million people in the United States have pet dogs.[204] The source shows that nearly 40% of American households own at least one dog, of which 67% own just one dog, 25% own two dogs, and nearly 9% own more than two dogs. The data also shows an equal number of male and female pet dogs; less than one-fifth of the owned dogs come from shelters.[205]

Workers

In addition to dogs' role as companion animals, dogs have been bred for

psychiatric service dogs, assist individuals with disabilities.[212][213] A study of 29 dogs found that 9 dogs owned by people with epilepsy were reported to exhibit attention-getting behavior to their handler 30 seconds to 45 minutes prior to an impending seizure; there was no significant correlation between the patients' demographics, health, or attitude towards their pets.[214]

Shows and sports

See also: Dog show

Dogs compete in breed-conformation shows and dog sports (including racing, sledding, and agility competitions). In dog shows, also referred to as "breed shows", a judge familiar with the specific dog breed evaluates individual purebred dogs for conformity with their established breed type as described in a breed standard.[215] Weight pulling, a dog sport involving pulling weight, has been criticized for promoting doping and for its risk of injury.[216]

Dogs as food

Main article: Dog meat

Humans have consumed dog meat going back at least 14,000 years. It is unknown to what extent prehistoric dogs were consumed and bred for meat. For centuries, the practice was prevalent in Southeast Asia, East Asia, Africa, and Oceania before cultural changes triggered by the spread of religions resulted in dog meat consumption declining and becoming more taboo.[217] Switzerland, Polynesia, and pre-Columbian Mexico historically consumed dog meat.[218][219][220] Some Native American dogs, like the Peruvian Hairless Dog and Xoloitzcuintle, were raised to be sacrificed and eaten.[221][222] Han Chinese traditionally ate dogs.[223] Consumption of dog meat declined but did not end during the Sui dynasty (581–618) and Tang dynasty (618–907) due in part to the spread of Buddhism and the upper class rejecting the practice.[224][225] Dog consumption was rare in India, Iran, and Europe.[217]

Eating dog meat is a

East Asian countries, including China,[193] Vietnam,[194] Korea,[229] Indonesia,[230] and the Philippines.[231] An estimated 30 million dogs are killed and consumed in Asia every year.[223] China is the world's largest consumer of dogs, with an estimated 10 to 20 million dogs killed every year for human consumption.[232] In Vietnam, about 5 million dogs are slaughtered annually.[233] In 2024, China, Singapore, and Thailand placed a ban on the consumption of dogs within their borders.[234] In some parts of Poland[235][236] and Central Asia,[237][238] dog fat is reportedly believed to be beneficial for the lungs.[239] Proponents of eating dog meat have argued that placing a distinction between livestock and dogs is Western hypocrisy and that there is no difference in eating different animals' meat.[240][241][242][243]

There is a long history of dog meat consumption in South Korea, but the practice has fallen out of favor.[244] A 2017 survey found that under 40% of participants supported a ban on the distribution and consumption of dog meat. This increased to over 50% in 2020, suggesting changing attitudes, particularly among younger individuals.[7] In 2018, the South Korean government passed a bill banning restaurants that sell dog meat from doing so during that year's Winter Olympics.[245] On 9 January 2024, the South Korean parliament passed a law banning the distribution and sale of dog meat. It will take effect in 2027, with plans to assist dog farmers in transitioning to other products.[246] The primary type of dog raised for meat in South Korea has been the Nureongi.[247] In North Korea where meat is scarce, eating dog is a common and accepted practice, officially promoted by the government.[248][249]

Health risks

Further information:
Dog bite prevention

In 2018, the World Health Organization (WHO) reported that 59,000 people died globally from rabies, with 59.6% of the deaths in Asia and 36.4% in Africa. Rabies is a disease for which dogs are the most significant vector.[250] Dog bites affect tens of millions of people globally each year.[251] The primary victims of dog bite incidents are children. They are more likely to sustain more serious injuries from bites, which can lead to death.[251] Sharp claws can lacerate flesh and cause serious infections.[252] In the United States, cats and dogs are a factor in more than 86,000 falls each year.[253] It has been estimated that around 2% of dog-related injuries treated in U.K. hospitals are domestic accidents. The same study concluded that dog-associated road accidents involving injuries more commonly involve two-wheeled vehicles.[254] Some countries and cities have also banned or restricted certain dog breeds, usually for safety concerns.[255]

roundworm) eggs in dog feces can cause toxocariasis. It is estimated that nearly 14% of people in the United States are infected with Toxocara; about 10,000 cases are reported each year.[256] Untreated toxocariasis can cause retinal damage and decreased vision.[257] Dog feces can also contain hookworms that cause cutaneous larva migrans in humans.[258][259]

Health benefits

A woman walking a dog

The scientific evidence is mixed as to whether a dog's companionship can enhance human physical and psychological well-being.[260] Studies suggest that there are benefits to physical health and psychological well-being, but they have been criticized for being "poorly controlled".[261][262] One study states that "the health of elderly people is related to their health habits and social supports but not to their ownership of, or attachment to, a companion animal".[263] Earlier studies have shown that pet-dog or -cat guardians make fewer hospital visits and are less likely to be on medication for heart problems and sleeping difficulties than non-guardians.[263] People with pet dogs took considerably more physical exercise than those with cats or those without pets; these effects are relatively long-term.[264] Pet guardianship has also been associated with increased survival in cases of coronary artery disease. Human guardians are significantly less likely to die within one year of an acute myocardial infarction than those who do not own dogs.[265] Studies have found a small to moderate correlation between dog-ownership and increased adult physical-activity levels.[266]

A 2005 paper by the

British Medical Journal states:[260]

Recent research has failed to support earlier findings that pet ownership is associated with a reduced risk of cardiovascular disease, a reduced use of general practitioner services, or any psychological or physical benefits on health for community dwelling older people. Research has, however, pointed to significantly less absenteeism from school through sickness among children who live with pets.

Health benefits of dogs can result from contact with dogs in general, not solely from having dogs as pets. For example, when in a pet dog's presence, people show reductions in cardiovascular, behavioral, and psychological indicators of anxiety[267] and are exposed to immune-stimulating microorganisms, which can protect against allergies and autoimmune diseases (according to the hygiene hypothesis). Other benefits include dogs as social support.[268]

One study indicated that wheelchair-users experience more positive social interactions with strangers when accompanied by a dog than when they are not.[269] In a 2015 study, it was found that having a pet made people more inclined to foster positive relationships with their neighbors.[270] In one study, new guardians reported a significant reduction in minor health problems during the first month following pet acquisition, which was sustained through the 10-month study.[264]

Using dogs and other animals as a part of therapy dates back to the late-18th century, when animals were introduced into mental institutions to help socialize patients with mental disorders.[271] Animal-assisted intervention research has shown that animal-assisted therapy with a dog can increase smiling and laughing among people with Alzheimer's disease.[272] One study demonstrated that children with ADHD and conduct disorders who participated in an education program with dogs and other animals showed increased attendance, knowledge, and skill-objectives and decreased antisocial and violent behavior compared with those not in an animal-assisted program.[273]

Cultural importance

Main articles: Cultural depictions of dogs and Dogs in religion
Further information: List of fictional dogs
Third Circle of Hell, depicted by William Blake

Artworks have depicted dogs as symbols of guidance, protection, loyalty, fidelity, faithfulness, alertness, and love.[274] In ancient Mesopotamia, from the Old Babylonian period until the Neo-Babylonian period, dogs were the symbol of Ninisina, the goddess of healing and medicine,[275] and her worshippers frequently dedicated small models of seated dogs to her.[275] In the Neo-Assyrian and Neo-Babylonian periods, dogs served as emblems of magical protection.[275] In China, Korea, and Japan, dogs are viewed as kind protectors.[276]

In mythology, dogs often appear as pets or as watchdogs.[276] Stories of dogs guarding the gates of the underworld recur throughout Indo-European mythologies[277][278] and may originate from Proto-Indo-European traditions.[277][278] In Greek mythology, Cerberus is a three-headed, dragon-tailed watchdog who guards the gates of Hades.[276] Dogs also feature in association with the Greek goddess Hecate.[279] In Norse mythology, a dog called Garmr guards Hel, a realm of the dead.[276] In Persian mythology, two four-eyed dogs guard the Chinvat Bridge.[276] In Welsh mythology, Cŵn Annwn guards Annwn.[276] In Hindu mythology, Yama, the god of death, owns two watchdogs named Shyama and Sharvara, which each have four eyes—they are said to watch over the gates of Naraka.[280] A black dog is considered to be the vahana (vehicle) of Bhairava (an incarnation of Shiva).[281]

In

Jewish law does not prohibit keeping dogs and other pets but requires Jews to feed dogs (and other animals that they own) before themselves and to make arrangements for feeding them before obtaining them.[284][285] The view on dogs in Islam is mixed, with some schools of thought viewing them as unclean,[276] although Khaled Abou El Fadl states that this view is based on "pre-Islamic Arab mythology" and "a tradition [...] falsely attributed to the Prophet".[286] The Sunni Maliki school jurists disagree with the idea that dogs are unclean.[287]

Terminology

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Bibliography
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