Jaw casts and skull replicas
Jaws and skulls are cast in durable urethane plastic and filled with ridgid urethane foam for extra stability.  They are highly detailed, down to the pores and sutures in the bone and wear on the teeth.  These make great teaching aids and craft items.  They are available in either a natural bone-like cream color or white, but can be painted and will accept many types of glue, especially hot glue.
African and exotic animals:
Baboon (male) 
Hyena (spotted)
Russian (European) wolf
Liger (lion tiger hybrid)

North American animals:
Black bear
Mountain lion
Wolf-dog hybrid
Grizzly bear

Domestic animals
English Mastiff
Neopolitan Mastiff
Saint Bernhard
Doberman Pinscher
Wolf-dog hybrid
Great Dane
American Pit Bull
Alaskan Malamute
German Shepherd
Bouvier des Flandres
Bull Mastiff