This breed was bred by English gamekeepers to aid English wardens or gamekeepers with guarding estate property and to capture poachers. As a result, the Bullmastiff is now referred to as the Gamekeeper’s Night Dog. The favored colour, by gamekeepers, was brindle as this colour works as a far better disguise, especially at night. They bark much less frequently than other strains; however, they’re going to bark on alarm.

Physical Appearance

Males should be 25 to 27 inches (64 to 69 cm) tall (AKC Std.) at the withers and 110 to 130 pounds (50 to 59 kg). The female breed should be around 24-26 inches at the withers, and around 100 to 120 pounds. Breeders discourage exceeding these measurements.

The coat of a Bullmastiff may appear in red, fawn, or brindle. These are the only acceptable colors in the AKC standard. The fawn can vary from a really light brown to a reddish brown. Reddish can range from a light red-fawn to a dark crimson that is rich. A Bullmastiff should have no white markings, except for on the chest in which a little white is allowed.


They’re exceptionally protective of property and their people and it is highly improbable a strange creature will be welcome in the yard of a Bullmastiff. They do fine in a multiple dog dwelling, if raised alongside other creatures, but new dogs (especially of exactly the same sex) should not be introduced into a Bullmastiff’s home. This strain is not going to back down if provoked by another creature and is fearless. When properly socialized around people and creatures, Bullmastiffs are normally docile creatures and can be trusted with new people. This breed is prone to flatulence, snorting, snoring, and drooling.


A UK survey sets the median lifespan of the Bullmastiff at 7 to 8 years old. A Bullmastiff will not stop growing until about three plus a half years old. Bullmastiffs are prone to certain hereditary diseases including: Hip dysplasia, Elbow dysplasia, Entropion, hypothyroidism, and Lymphoma cancer.
Because the trait is an autosomal dominant one, progressive retinal atrophy is a particular difficulty as well. Other common health issues include arthritis and bloat.