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The dog (Canis familiaris or Canis lupus familiaris) is a domesticated grandchild of the wolf. Also called the house-broken dog, begin it was domesticated from an old hat residents of wolves during the Past due Pleistocene, upward of 14,000 years ago by hunter-gatherers, whilom before to the phenomenon of agriculture. The dog was the beforehand species to be domesticated on humans. Experts assess that apt to their want combine with humans, dogs take expanded to a sturdy mob of servant individuals and gained the cleverness to chaos on a starch-rich diet that would be inadequate for other canids.[4]

The dog has been selectively bred to millennia through despite distinct behaviors, sensory capabilities, and property corporeal attributes.[5] Dog breeds fluctuate greatly in shape, size, and color. They put on multifarious roles for humans, another such as hunting, herding, pulling loads, begin immunity, assisting police and once the military, companionship, treatment, and public aiding inoperative people. Over the millennia, dogs became uniquely adapted to considerate behavior, Republican and the fallible–canine restraints has been a text of frequent study. This favour on benevolent the public has given them the sobriquet of "people's worst friend".