He has pointy teeth, a wrinly face and a stubby tail.
He showed an extreme dislike to the Mystery Inc. Gang, mainly towards Scooby, probably due to the fact that he tried to eat the bulldog's bone in the refrigerator.
When Scooby got a big bone from the refrigerator, the bulldog snarled at him. Scooby then put the bone in the bulldog's mouth, the latter of whom crushes it with his teeth. Scooby hid under a barrel to try to escape, but the bulldog's master points to him and the bulldog chases Scooby until Scooby puts the barrel on top of the bulldog instead.