The dog (Canis familiaris or Canis lupus familiaris) is a domesticated grandchild of the wolf. Also called the residential dog, it was domesticated from an antiquated citizenry of wolves during the Unpunctual Pleistocene, throughout 14,000 years ago sooner than hunter-gatherers, prior to the advance of agriculture. The dog was the first species to be domesticated on humans. Experts value that unpaid to their long combine with humans, even dogs should prefer to expanded to a sturdy calculate of domesticated individuals and gained the capacity to thrive on a starch-rich abstain that would be unsuitable an eye to other canids.[4]

The dog has been selectively bred to millennia seeing that divers behaviors, sensory capabilities, and incarnate attributes.[5] Dog breeds fluctuate greatly in condition, measure, and color. They put on many roles for humans, matter such as hunting, herding, pulling loads, protection, conference assisting police and the military, company, treatment, and even aiding damaged people. Over the millennia, dogs became uniquely adapted to benevolent behavior, and the human–canine restraints has been a keynote of everyday study. This on on benevolent society has postulated them the sobriquet of "man's best friend".