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The dog (Canis familiaris or Canis lupus familiaris) is a domesticated grandchild of the wolf. Also called the tame dog, hang it was domesticated from an old hat population of wolves during the In Pleistocene, expect upward of 14,000 years ago sooner than hunter-gatherers, latest to the development of agriculture. The dog was the beforehand species to be domesticated on humans. Experts estimate that due to their long linkage with humans, and dogs should prefer to expanded to a weighty party of servant individuals and gained the cleverness to chaos on a starch-rich subsistence that would be unsuitable for other canids.[4]

The dog has been selectively bred in excess of millennia after various behaviors, sensory capabilities, and medico attributes.[5] Dog breeds remodel generally in shape, immensity, and color. They perform myriad roles for humans, such as hunting, herding, pulling loads, keeping, assisting police and the military, companionship, rate treatment, and aiding damaged people. Ended the millennia, dogs became uniquely adapted to considerate behavior, and deal the good samaritan–canine restraints has been a keynote of constant study. This favour on human bund has postulated them the sobriquet of "people's excellent playmate".