The Bullmastiff was developed in England in the 1800s to help gamekeepers keep poachers out of estates and game preserves. The dog needed to track quietly and pin and hold poachers without mauling them. The winning combination of size, speed, and ferociousness turned out to be 60 percent Mastiff and 40 percent Bulldog. Today, as a companion, the Bullmastiff still can be counted on for its watchdog abilities. The AKC recognized the breed in 1933.


Large; females 24 to 26 inches, 100 to 120 pounds; males 25 to 27 inches, 110 to 130 pounds.


Red, fawn, and brindle.


Gentle, quiet, devoted guardian and companion. Intelligent, stubborn when it comes to obedience training.

Energy level:


Best owner:

Firm but loving owner who has time and patience for training.


Moderate daily exercise (leashed), socialization, roomy indoor accommodations (soft, comfy bed), slobber maintenance.

Life expectancy:

8 to 10 years.