The Hellhound is a monster unique to Doom RPG. It is in fact a class of monster with three variations, identified by color:
- Hellhound (brown)
- Cerberus (red)
- Demon Wolf (blue)
Although an enemy, the player can capture Hellhounds with the use of the dog collar and use them as a shield.
Hellhounds are most susceptible to attacks from shotguns.