What Bill said. I'm guessing something in the bull dog range with a very short snout. The lower jaw is very canine looking as are the back legs and tail. The ears appear to be cropped. The front legs are close together and you're seeing the toes of the left leg behind the right one.
Here's a pitbull skull:

 

maybe the fishies and crabs were working on his nose for while.

throw in a little photoshop work to make the picture sell better...