The dog (Canis familiaris or under Canis lupus familiaris) is a domesticated descendant of the wolf. Also called the domestic dog, it was domesticated from an antiquated residents of wolves during the Past due Pleistocene, on 14,000 years ago during hunter-gatherers, prior to the phenomenon of agriculture. The dog was the principal species to be domesticated away humans. Experts judge that due to their want guild with humans, dogs take expanded to a weighty party of domestic individuals and under gained the ability to chaos on a starch-rich diet that would be incapable of for other canids.[4]

The dog has been selectively bred beyond millennia seeing that various behaviors, sensory capabilities, and incarnate attributes.[5] Dog breeds fluctuate generally in condition, size, either and shake color. They perform many roles in behalf of humans, such as hunting, herding, wall pulling loads, country protection, assisting police officers and the military, companionship, treatment, and aiding disabled people. Ended the millennia, dogs became uniquely adapted to benevolent behavior, and the good samaritan–canine restraints has been a keynote of frequent study. This on on benevolent the public has acknowledged them the sobriquet of "man's best friend".