the.com/bloodhound

means A large, droopy-eared dog bred for its extraordinary sense of smell, used to track people or scents over long distances — also used figuratively for a relentless pursuer or investigator.

from The name is straightforward English: 'blood' plus 'hound,' first recorded in medieval times. The 'blood' part likely refers not to gore but to pedigree — these were dogs of pure, tracked bloodlines, bred and kept carefully by nobility for hunting wounded game by scent trail. Some accounts also tie it to their use trailing wounded or fleeing creatures, following a blood trail literally. The breed itself is ancient, with roots possibly going back to hounds kept in medieval European monasteries, prized above all for the nose — which remains, to this day, one of the most sensitive in the animal kingdom.