Mastiff

Mastiffs are a breed of dogs found primarily in Gilneas. Several mobs that once used the hyena model have been updated to use the new mastiff model in Cataclysm, such as the various hounds employed by the Scarlet Crusade.

They appear to be more common pets and companions of human societies, including vrykul.

As a hunter pet
Mastiffs will be tamable in Cataclysm, being the first members of dog, a new ferocity pet class. Players that start as a worgen hunter will receive a mastiff as their first pet.