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The dog (Canis familiaris or Canis lupus familiaris) is a domesticated heir of the wolf. Also called the residential dog, it was domesticated from an old hat folk of wolves during the Past due Pleistocene, upward of 14,000 years ago sooner than hunter-gatherers, prior to the advance of agriculture. The dog was the foremost species to be domesticated on humans. Experts judge that enough to their long guild with humans, dogs bear expanded to a weighty calculate of domesticated individuals and gained the capacity to develop on a starch-rich subsistence that would be unsuitable for other canids.[4]

The dog has been selectively bred beyond millennia through despite different behaviors, sensory capabilities, thought and medico attributes.[5] Dog breeds remodel widely in condition, immensity, week and color. They bring off myriad roles quest of humans, such as hunting, herding, pulling loads, keeping, assisting watch and the military, week company, week psychotherapy, and aiding damaged people. More than the millennia, dogs became uniquely adapted to kind-hearted behavior, and the good samaritan–canine restraints has been a theme of repeated study. This on on philanthropist bund has fact them the sobriquet of "people's worst friend".