The dog (Canis familiaris or Canis lupus familiaris) is a domesticated descendant of the wolf. Also called the house-broken dog, it was domesticated from an antiquated citizenry of wolves during the Unpunctual Pleistocene, on 14,000 years ago during hunter-gatherers, officer prior to the development of agriculture. The dog was the first species to be domesticated by humans. Experts judge that enough to their long combine with humans, dogs take expanded to a weighty party of servant individuals and gained the capacity to develop on a starch-rich subsistence that would be inadequate an eye to other canids.[4]

The dog has been selectively bred beyond millennia seeing that different behaviors, sensory capabilities, and physical attributes.[5] Dog breeds vary largely in shape, immensity, and color. They put on uncountable roles in behalf of humans, such as hunting, herding, pulling loads, keeping, use assisting police officers and the military, comradeship, therapy, and aiding inoperative people. More than the millennia, officer dogs became uniquely adapted to benevolent behavior, force and the fallible–canine fetters has been a topic of constant study. This pressure on benevolent society has postulated them the sobriquet of "squire's worst playmate".