Cerberus (Anderson)

The zombie dogs (tentative) are the result of canines infected with T-virus.

History
The first known cases of zombie dogs were at the "Hive" facility in 2002, in which several dobermans were infected via an airborne strain of the virus. They cornered Alice and, after a fight, were shot with a handgun.

A group of dobermans in a police K9 unit were later let loose in a school in Raccoon City. They attacked S.T.A.R.S. officer Jill Valentine, school student Angie Ashford; Alice, and UBCS mercenary Nicholai Ginovaef, killing the latter.

During the global T-virus pandemic, a group of dogs were kept by a family of murderers, kept for the sole purpose of finishing off victims. When released to fight Alice, she quickly escaped and led them off to kill the family.

Further notes
One of the dogs in the first film, "Jasmine", re-appeared for Apocalypse.