Transformers Movie Info

In Transformers 2 Megan Fox has a big dog named bone(crusher), What kind of dog is he?

From what I found it was a dog that Michael Bay adopted during production, just can't find out what breed he is.

Public Comments

1. Mastiff I believe.

   Looks like this right? http://puppydogweb.com/gallery/mastiffs/mastiff_donnellan.JPG