Hellhound

A demonic dog of hell, usually referring to Cerberus, the dog of Hades from Greek Mythology. The ghostly hounds are said to haunt parts of the United Kingdom and many names are given to the apparitions: Black Shuck of East Anglia, Moddey Dhoo of the Isle of Man, Gwyllgi of Wales. Hellhounds are a common creature in fantasy fiction, such as in Arthur Conan Doyle's "The Hound of the Baskervilles" and Frank Belknap Long's "The Hounds of Tinadalos". They are also a common enemy in role-playing and video games, including "Dungeons & Dragons", "Shadowrun", "RuneScape", "Adventure Quest" and the "Zork" series.

– Pad of Definitions (2.08 Crossroad Blues), Official Website