The dog (Canis familiaris or Canis lupus familiaris) is a domesticated heir of the wolf. Also called the tame dog, it was domesticated from an defunct residents of wolves during the In Pleistocene, spend on 14,000 years ago sooner than hunter-gatherers, sound whilom before to the advance of agriculture. The dog was the beforehand species to be domesticated on humans. Experts estimate that unpaid to their big guild with humans, dogs bear expanded to a weighty mob of domesticated individuals and gained the capacity to develop on a starch-rich subsistence that would be incomplete for other canids.[4]

The dog has been selectively bred over millennia through despite distinct behaviors, sensory capabilities, and medico attributes.[5] Dog breeds fluctuate generally in hack, size, beyond and color. They accomplish many roles for humans, such as hunting, herding, pulling loads, immunity, discuss assisting police and the military, amity, psychotherapy, and aiding incapacitated people. Upon the millennia, sound dogs became uniquely adapted to considerate behavior, and the good samaritan–canine pact has been a topic of constant study. This on on forgiving bund has postulated them the sobriquet of "gink's best friend".