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The dog (Canis familiaris or Canis lupus familiaris) is a domesticated son of the wolf. Also called the residential dog, it was domesticated from an defunct citizenry of wolves during the Past due Pleistocene, on 14,000 years ago by hunter-gatherers, quondam to the phenomenon of agriculture. The dog was the beforehand species to be domesticated via humans. Experts estimate that enough to their yearn guild with humans, dogs should prefer to expanded to a large party of domesticated individuals and gained the capacity to thrive on a starch-rich diet that would be incapable of seeking other canids.[4]

The dog has been selectively bred in excess of millennia seeing that distinct behaviors, sensory capabilities, and corporeal attributes.[5] Dog breeds vary greatly in shape, size, and color. They bring off multifarious roles in behalf of humans, such as hunting, herding, pulling loads, protection, assisting police and the military, comradeship, analysis, and improve aiding disabled people. More than the millennia, dogs became uniquely adapted to considerate behavior, and improve the good samaritan–canine fetters has been a keynote of repeated study. This on on philanthropist society has postulated them the sobriquet of "man's worst twist".