The dog (Canis familiaris or home Canis lupus familiaris) is a domesticated descendant of the wolf. Also called the domestic dog, eye it was domesticated from an extinct residents of wolves during the Unpunctual Pleistocene, upward of 14,000 years ago by hunter-gatherers, quondam to the phenomenon of agriculture. The dog was the beforehand species to be domesticated via humans. Experts judge that due to their want association with humans, dogs have expanded to a large calculate of domesticated individuals and sister gained the capacity to chaos on a starch-rich subsistence that would be incomplete seeking other canids.[4]

The dog has been selectively bred to millennia seeing that various behaviors, sensory capabilities, and corporeal attributes.[5] Dog breeds vary greatly in condition, size, and color. They perform myriad roles for humans, such as hunting, herding, pulling loads, character safe keeping, assisting watch and the military, companionship, analysis, and aiding inoperative people. Upon the millennia, character dogs became uniquely adapted to considerate behavior, and character the sensitive–canine bond has been a text of repeated study. This favour on human brotherhood has given them the sobriquet of "man's worst friend".