The Bullmastiff is a commanding breed developed to guard and protect. The breed has a muscular build. It has muscular back that is straight with shoulder that slope. It has a massive head with a wide muzzle. Its nose is larger than average and its eyes are average in size. The breed’s ears are somewhat small and triangular in shape. Its neck is thick, well muscled, and angular. The front legs are straight. The back legs feature muscular hocks and thighs.


Although the Bullmastiff is generally an easy-going breed, it is not pleasant with other dogs. It is usually aloof with strangers. It is an effective guard dog. Training the breed is important so that it will coexist peacefully with other pets and children. This breed enjoys spending time with its family, but it is not outwardly expressive.

Height and Weight

Male height: 25-27 inchesMale weight: 110-130 poundsFemale height: 24-26 inchesFemale weight: 100-120 pounds

Health Problems

There are a few health conditions associated with the Bullmastiff. This breed may develop elbow and hip dysplasia and gastric torsion. Some types may develop progressive retinal atrophy (PRA).

Ideal Living Conditions

The Bullmastiff is most suitable for indoor living conditions. This breed has a low energy level, so it should have access to daily exercise when it resides indoors.


If left to its own devices, the Bullmastiff will not obtain sufficient exercise. It is a breed that is not very energetic. Since most types remain indoors most of the time, it is imperative they it obtain daily opportunities of exercise.

Life Expectancy

The Bullmastiff has an average life expectancy of 8-10 years.

Litter Size

The Bullmastiff has an average of 7 puppies.


Infrequent brushing and washing are fine for the Bullmastiff. The breed has a low-maintenance coat.


The Bullmastiff is the result of crossing a Mastiff and a Bulldog.




The Bullmastiff consists of a variety of colors. The coat may consist of solid red or grayish brown. The color may be a combination coat of varying shades of light brown.