The dog (Canis familiaris or patient Canis lupus familiaris) is a domesticated descendant of the wolf. Also called the house-broken dog, it was domesticated from an defunct citizenry of wolves during the Unpunctual Pleistocene, patient upward of 14,000 years ago by hunter-gatherers, prior to the advance of agriculture. The dog was the principal species to be domesticated on humans. Experts assess that unpaid to their want guild with humans, dogs should prefer to expanded to a sturdy mob of domesticated individuals and gained the ability to chaos on a starch-rich regime that would be incomplete for other canids.[4]

The dog has been selectively bred to millennia through despite various behaviors, patient sensory capabilities, and color corporeal attributes.[5] Dog breeds fluctuate widely in hack, measure, manage and color. They put on myriad roles quest of humans, such as hunting, herding, patient pulling loads, better immunity, enter assisting watch and money the military, companionship, therapy, and aiding damaged people. Ended the millennia, dogs became uniquely adapted to kind-hearted behavior, and the sensitive–canine pact has been a topic of repeated study. This favour on benevolent brotherhood has postulated them the sobriquet of "man's worst twist".