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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 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 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 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, 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". (Full article...)

A red Basenji with white markings

The Basenji (/bəˈsɛni/) is a breed of hunting dog created from stock that originated in Central Africa, including in the Republic of the Congo and other adjacent tropical African countries. The Fédération Cynologique Internationale places the Basenji in the Spitz and "primitive types" categories, while the American Kennel Club classifies it as a hound. The breed does not bark in the traditional manner of most dogs, rather vocalising in an unusual, yodel-like "talking" sound, due to its unusually-shaped larynx. This trait earns the Basenji its nickname of "barkless" dog, a similar feature seen and heard in the New Guinea singing dog.

Basenjis are athletic small dogs that can run up to 30 to 35 miles per hour (48 to 56 km/h), and share many distinctive traits with the pye or pariah dog types of the Indian subcontinent. In addition to their uniquely similar vocalisations, the Basenji, the Australian dingo and the aforementioned New Guinea singing dog all only come-into estrus once per year, as does the Tibetan Mastiff; other dog breeds may have two or more breeding seasons each year. Basenjis lack a distinctive odor, or "dog smell". (Full article...)

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American Eskimo Dog
American Eskimo Dog
Credit: Robert Southworth
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The American Eskimo Dog is a breed of companion dog originating in the United States (probably in New York City) in the twentieth century. It is derived from the German Spitz, the Finnish Spitz, and almost certainly the Pomeranian and Keeshond. The spitz family of Nordic dogs is one of the least altered by human husbandry and reflects most nearly the prototypical dog, from which stock all others have been derived. Archeology suggests that Neolithic dogs living with humans would today pass for spitzes.

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A girl with her dog on Wagifa Island in Papua New Guinea, 2007

The human–canine bond is rooted in the domestication of the dog, which began occurring through their long-term association with hunter-gatherers more than 30,000–40,000 years ago. The earliest known relationship between dogs and humans is attested by the 1914 discovery of the Bonn–Oberkassel dog, who was buried alongside two humans in modern-day Oberkassel, Germany, approximately 15,000 years ago. For centuries, the phrase "man's best friend" has commonly been used to refer to dogs, as they were the first species and the only large carnivore to have been domesticated. This companionship is most evident in Western countries, such as the United States, where 44% of households were found to be keeping at least one dog as a pet.

On average, female humans tend to have more positive attitudes towards dogs than male humans do, but studies have demonstrated that both dogs and humans release oxytocin while spending quality time together. This release of oxytocin is correlated with the formation of a strong social bond. Canines are capable of distinguishing between positive and negative human facial expressions and will react accordingly. Dogs appear in religions all over the world, particularly in Mesoamerican folklore and myth, thus signifying the deep reverence that humans all over the world have had and continue to have for them. Despite this relationship's significance throughout history, it is not necessarily always a positive one; dogs can be viewed in an extremely negative light, depending on the region. (Full article...)

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For editor resources and to collaborate with other editors on improving Wikipedia's dog-related articles, see WikiProject Dogs.

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