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Bullmastiff Breed Facts and Information

Updated on June 17, 2025
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The Bullmastiff is a large, powerful breed originally developed to guard estates. Known for their loyalty and calm demeanor, these protective dogs are devoted companions that can adapt well to family living with proper training.

TEMPERAMENT

Loyal, Protective, Calm

COLORS

Brindle, Red, Fawn

Characteristic card iconWEIGHT

100 – 130 Pounds

Characteristic card iconHEIGHT

24 – 27 Inches

Characteristic card iconLIFE EXPECTANCY

8 – 10 years

Maintenance Level

Low Maintenance

High Maintenance

Friendliness

Reserved

Extroverted

About Bullmastiff

The Bullmastiff first appeared in the 1860’s when British gamekeepers crossed Bulldogs with Mastiffs to create a dog capable of defending their master’s vast estates against poachers. Bred to be loyal, watchful, and determined in the face of danger, these noble giants continue to be a source of comfort for their owners today. Though they are large and intimidating, properly socialized Bullmastiffs are calm and loyal companions who can adapt to many different living environments.

Origin: United Kingdom

Working Group

Dogs of the Working Group were bred to perform such jobs as guarding property, pulling sleds and performing water rescues.

Breed Appearance

Bullmastiffs are muscular, powerful animals. They have an alert expression, a broad muzzle, and triangular ears that flop down beside the head. Prominent cheeks, a wrinkled face, and a dark muzzle give them a distinctive look. They have a very thick neck and broad chests.

Fawn coat example

Size & Weight

Male Bullmastiffs weigh between 110 and 130 pounds, and are 25 to 27 inches tall. Females are 24 to 26 inches tall and weigh between 100 and 120 pounds. Their sheer size combined with their muscular build gives them a commanding presence.
Full Grown
Female
24 in. / 100 lbs.
Male
27 in. / 130 lbs.
Height is measured up to the shoulders.

Breed Characteristics

Size
TinyJumbo
Weight
LightHeavy
Shedding
MinimalAbundant
Coat Length
ShortLong
Grooming Frequency
OccasionalFrequent
Living Space
City ApartmentRanch
Exercise
Couch potatoBring it on!
Climate
WarmCold
Personality
AntisocialOutgoing
Protection
NoneBodyguard
Behavior with Kids
Always monitorBabysitter
Training
HeadstrongObedient
Barking
MuteLoud

How to Care for a Bullmastiff

Caring for a Bullmastiff means balancing grooming, training, health, nutrition, and exercise with their calm lifestyle. Consistent routines and thoughtful care help support their size, protective instincts, and overall well-being.

Cost of Owning

On average, owning a middle-aged Bullmastiff costs around $2000 per year.
$400Vet Care
$400Grooming & Boarding
$700Food & Treats
$500Others

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Fun Facts

Many celebrities have owned Bullmastiffs, but the most famous may have been Butkus, owned by Sylvester Stallone. Butkus had his claim to fame in Rocky alongside his owner.

The official mascot of the Cleveland Browns is Swagger the Bullmastiff.

Oil magnate John D. Rockefeller brought Bullmastiffs to the United States in the 1920s to guard his country estate.

History

Seeking to create a dog fast enough to both pursue poachers and strong enough to hold them down, British gamekeepers began breeding the large Mastiff with the quick, determined Bulldog in the mid-1800’s. Early Bullmastiffs were known as the “Gamekeeper's Night Dog”. In these early days, the Bullmastiff was a crossbreed created to fulfill a specific purpose, but around the beginning of the 20th century, they began to be bred as a distinct variety.

The English Kennel club declared the Bullmastiff breed pure in 1924, establishing a genetic background of approximately 60% Mastiff and 40% Bulldog. The American Kennel Club followed suit in 1934. Today, the Bullmastiff has evolved far beyond its original utilitarian roots, and can be found in the ring at dog shows or living happily as a family pet.

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