A bloodhound (also known as the St. Hubert hound and Sleuth Hound) is a large breed of dog that was bred originally to hunt deer and wild boar, later specifically to track human beings by scent. It is famed for its ability to follow scents hours or even days old over great distances. Its extraordinarily keen nose is combined with a strong and tenacious tracking instinct, producing the ideal scenthound, and it is used by police and law enforcement the world over to track escaped prisoners, missing persons, and even missing animals.