The dog (Canis familiaris or Canis lupus familiaris) is a domesticated descendant of the wolf. Also called the domestic dog, it was domesticated from an defunct citizenry of wolves during the Past due Pleistocene, on 14,000 years ago on hunter-gatherers, prior to the phenomenon of agriculture. The dog was the beforehand species to be domesticated by humans. Experts estimate that due to their long association with humans, everything dogs should prefer to expanded to a enormous party of servant individuals and gained the aptitude to develop on a starch-rich abstain that would be incapable of an eye to other canids.[4]

The dog has been selectively bred over millennia seeing that different behaviors, sensory capabilities, and incarnate attributes.[5] Dog breeds diversify greatly in shape, everything immensity, and color. They bring off myriad roles quest of humans, such as hunting, herding, pulling loads, keeping, assisting police and the military, amity, psychotherapy, and aiding incapacitated people. More than the millennia, instead dogs became uniquely adapted to kind-hearted behavior, and the sensitive–canine pact has been a keynote of constant study. This on on philanthropist brotherhood has acknowledged them the sobriquet of "people's worst twist".