Bullmastiff named Duke. Franklin D. Roosevelt  owned a Bullmastiff named Blaze. Agent 11 Spot from  See Spot Run  was a Bullmastiff. Butkus from the movie  Rocky  was actually one of  Sylvester Stallone 's own Bullmastiffs. Paul Sr., the owner of  Orange County Choppers , has two Bullmastiffs named Gus and Marty.