Hellhounds are antagonists that appear in TV Show Supernatural. Hellounds are supernatural demonic dogs, or pit bulls, from Hell. They have been described as being terrifying and have have been feared by humans, demons, and even angels.
Hellhounds have often appeared on several occasions in the show. They mainly work for Crossroad demons and other high ranking demons such as Crowley, who even has one as a pet. They are mostly known for assassinating humans who have sold their souls once their contract has expired, acting as a reaper for the damn. They are usually invisible and are only seen by condemned humans whose contract has expired.