Health issues: The Bullmastiff dog breed is prone to hip dysplasia, cancer, tumours, eyelid problems, PRA and boils at the lip and bloat that need meals in amounts of food throughout day time. These kinds of good apartment dogs and good watchdogs. The Bull Mastiffs dog's height is 25 to 27 inches with the bitches measuring 24 to 26 centimetres. Well-known was developed as a ratter because a watch dog.