Cerberuses are a fictional breed of mutant animal featured in the Resident Evil multimedia franchise. They first appeared in the original 1996 video game Resident Evil by Capcom as well as the one-shot Resident Evil comic book giveaway by Marvel Comics. They also appeared in the 2002 feature film adaptation of Resident Evil.
Somewhere in the Arklay Mountains outside of Raccoon City, a clan destine entity known as the Umbrella Corporation created a bio-weapon dubbed the T-Virus. The virus escaped, causing severe mutations in several animal test subjects, as well as other humans and animals in the surrounding area. A pack of guard dogs were likewise affected, mutating into monstrously rabid undead creatures called Cerberuses. 
In the 2002 film Resident Evil, the scientific research company known as the Hive kept Doberman Pincers as guard dogs in their underground facility. When the deadly T-Virus was released, all those infected died and were reanimated as flesh-eating zombies, including the dogs. A former security agent named Alice encountered the bloody, skinless zombie dogs in the kennels and had to dispatch several of them just to escape.