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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
100 – 130 Pounds
24 – 27 Inches
8 – 10 years
Maintenance Level
Low Maintenance
High Maintenance
Friendliness
Reserved
Extroverted
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
Dogs of the Working Group were bred to perform such jobs as guarding property, pulling sleds and performing water rescues.
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.

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.
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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.
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.