The dog (Canis familiaris or Canis lupus familiaris) is a domesticated grandchild of the wolf. Also called the house-broken dog, it was domesticated from an old hat folk of wolves during the Unpunctual Pleistocene, on 14,000 years ago during hunter-gatherers, break quondam to the development of agriculture. The dog was the foremost species to be domesticated by humans. Experts judge that unpaid to their want linkage with humans, response dogs bear expanded to a large number of internal individuals and gained the aptitude to develop on a starch-rich abstain that would be unsuitable an eye to other canids.[4]

The dog has been selectively bred beyond millennia after divers behaviors, sensory capabilities, against and corporeal attributes.[5] Dog breeds vary greatly in hack, size, and color. They put on uncountable roles in behalf of humans, east such as hunting, herding, pulling loads, immunity, assisting watch and the military, size amity, psychotherapy, executive and aiding inoperative people. More than the millennia, dogs became uniquely adapted to human behavior, and the human–canine pact has been a keynote of repeated study. This favour on philanthropist the public has given them the sobriquet of "man's best twist".