Scent hounds (or scenthounds) are a Dog type of hound that primarily hunts by scent rather than sight. These Dog breed are and are generally regarded as having some of the most sensitive noses among . Scent hounds specialize in following scent or smells. Most of them tend to have long, drooping ears and large nasal cavities to enhance smell sensitivity. They need to have relatively high endurance to be able to keep track of scent over long distances and rough terrain. It is believed that they were first bred by the Celts by crossbreed mastiff-type dogs with . The first established scent hounds were St. Hubert Hounds (the ancestor of today's Bloodhound) bred by monks in Belgium during the Middle Ages.
Scent hounds specialize in following a smell or scent. Most of these breeds have long, drooping ears. One theory says that this trait helps to collect scent from the air and keep it near the dog's face and nose. They also have large nasal cavities, which helps them scent better. Their typically loose, moist lips are said to assist in trapping scent particles.
Because scent hounds tend to walk or run with their noses to the ground, many scent hound breeds have been developed such that the dog will hold their tail upright when on a scent. In addition, some breeds (e.g., beagle) have been bred to have white hair on the tips of their tails. These traits allow the dog's master to identify it at a distance or in longer grass.
Scent hounds do not need to be as fast as sighthounds, because they do not need to keep prey in sight, but they need endurance so they can stick with a scent and follow it for long distances over rough terrain. The best scent hounds can follow a scent trail even across running water and even when it is several days old. Most scent hounds are used for hunting in packs of multiple dogs. Longer-legged hounds run more quickly and usually require that the hunters follow on horseback; shorter-legged hounds allow hunters to follow on foot. Hunting with some breeds, such as German Bracke, American Foxhounds, or , involves allowing the pack of dogs to run freely while the hunters wait in a fixed spot until the dogs' baying announces that the game has been "Treeing". The hunters then go to the spot on foot, following the sound of the dogs' baying.
As they are bred to "give voice" when excited, scent hounds may bark much more frequently than other dog breeds. Although this can be a nuisance in settled areas, it is a valuable trait that allows the dog's handler to follow the dog or pack of dogs during a hunt even when they are out of sight, such as when following a Fox hunting or raccoon through woodland.
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