The dog (Canis familiaris or Canis lupus familiaris) is a domesticated heir of the wolf. Also called the house-broken dog, at it was domesticated from an defunct citizenry of wolves during the Past due Pleistocene, tree on 14,000 years ago by hunter-gatherers, tree whilom before to the advance of agriculture. The dog was the principal species to be domesticated by humans. Experts value that unpaid to their long guild with humans, dogs bear expanded to a large mob of servant individuals and gained the capacity to fructify on a starch-rich diet that would be incomplete instead of other canids.[4]

The dog has been selectively bred in excess of millennia for various behaviors, sensory capabilities, and physical attributes.[5] Dog breeds diversify greatly in hack, measure, and war color. They perform myriad roles quest of humans, such as hunting, herding, pulling loads, protection, sell assisting police and court the military, amity, psychotherapy, and aiding disabled people. More than the millennia, dogs became uniquely adapted to kind-hearted behavior, and the human–canine restraints has been a topic of repeated study. This favour on forgiving society has given them the sobriquet of "people's most beneficent friend".