In Green Run, through a Custom Games lobby, the host has the ability to turn on/off a Hellhound round if the host has selected a Survival or a Grief game mode map. The electric bolts that appear during a Hellhound round are supposedly linked towards the teleporter incident that occurred at the Der Riese facility.

One exception to this is Shi No Numa, where the Max Ammo may not be dropped by the Hellhound, but the next zombie the player kills. When the last Hellhound in their special round is killed, it will always drop a Max Ammo power-up. There are two variants of the Hellhound: the flaming Hellhound, which on top of being perpetually on fire will explode on death, and the normal Hellhound, that simply falls to the ground and will not explode when killed. The ground shakes whenever they spawn and there will be a heavy fog covering the map. They randomly spawn throughout the map (a ball of lightning will usually indicate whenever they spawn) in packs of two to four (depending on the amount of players) every four to five rounds and their sole objective is to kill the player by attacking with their teeth and claws or by exploding after death. Hellhounds resemble badly deformed German Shepherds.

She later had puppies, accounting for the rest of the Hellhounds. Fluffy was put in the Der Riese mainframe teleporter and turned into a deadly Hellhound. Hellhounds are essentially zombie- dogs that are a mutated version of Samantha's pet, Fluffy.

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