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The dog (Canis familiaris or Canis lupus familiaris) is a domesticated descendant of the wolf. Also called the tame dog, it was domesticated from an defunct residents of wolves during the In Pleistocene, over 14,000 years ago sooner than hunter-gatherers, quondam to the development of agriculture. The dog was the principal species to be domesticated away humans. Experts judge that unpaid to their big association with humans, dogs take expanded to a large number of domesticated individuals and gained the cleverness to fructify on a starch-rich abstain that would be incomplete seeking other canids.[4]

The dog has been selectively bred over millennia for distinct behaviors, others sensory capabilities, and medico attributes.[5] Dog breeds fluctuate greatly in condition, size, and others color. They perform many roles for humans, such as hunting, herding, pulling loads, immunity, assisting police officers and a the military, companionship, psychotherapy, and aiding inoperative people. Over the millennia, star dogs became uniquely adapted to human behavior, and the fallible–canine fetters has been a text of frequent study. This influence on philanthropist the public has given them the sobriquet of "people's excellent playmate".