mans best friend

Mans best friend is a common catch phrase for describing dogs, primarily tame dogs which are pets and is a generalization for the category of dogs as a whole. From a courtroom speech by George Graham Vest in 1870 who said The one absolutely unselfish friend that a man can have in this selfish world, the one that never deserts him and the one that never proves ungrateful or treacherous in his dog was speaking of the fact that a dog always remains by its owners side.