Dog, A Man's Best Friend

"Man's best friend" is a phrase referring to domestic dogs, highlighting their close relations, loyalty, and companionship with humans within many societies.
History
Before the evolution of wolf into dog, it is posited that Man and wolf worked together hunting game. Wolves were the superior tracker but man was the superior killer, thus wolves would lead man to the prey and man would leave some of the meat to the wolves. This working relationship eventually led to the evolution of dogs, although there is controversy as to the exact nature of that transition. Some say wolves evolved naturally into dogs, wherein the wolves that worked best with humans slowly began to assimilate and pass their domesticated genes down. Others say that humans took wolf pups and raised them to be domesticated. Either way, man and dog formed a working relationship.