The domestic dog (Canis lupus familiaris or Canis familiaris)^[4] is a wolf-like canid in the genus Canis,^[5] and is the most widely abundant terrestrial carnivore.^{[6][7][8][9][10]} The dog and the extant gray wolf are sister taxa^[11][12][13] as modern wolves are not closely related to the wolves that were first domesticated,^[12][13] which implies that the direct ancestor of the dog is extinct.^[14] The dog is the first species to be domesticated^[13][15] and has been selectively bred over millennia for various behaviors, sensory capabilities, and physical attributes