A bloohound (also known as the St. Hubert Hound) is a large breed of dog bred for the specific purpose of tracking human beings. Consequently, it is often used by authorities to track escaped prisoners or missing persons. It is a scenthound, famed for its ability to follow a scent hours or even days old, over long distances. Combining a keen sense of smell with a tenaciously strong tracking instinct, bloodhounds have proven their worth as the archetypal trailing dog.