Giant, friendly, obedient, and trustworthy, bullmastiff dogs make for excellent company. Find out more about the endearing bullmastiff if you enjoy large, intelligent canines with gentle personalities.

Bullmastiff Overview

COMMON NAMEBullmastiff
PET HEIGHT24.5 to 28 inches
PET WEIGHT101 to 122 pounds
LIFESPAN7.5 to 9.5 years
GOOD WITHchildren, families, seniors
TEMPERAMENTfriendly, gentle, outgoing, playful
VOCAL LEVELinfrequent
BREED SIZEextra large (101 lbs. or more)
COLORSfawn, red

A bullmastiff: what is it? It is a hybrid that combines the greatest traits of both the mastiff and the bulldog. This is the dog for you if you’re looking for a strong, well-mannered protector who also loves you and your kids and is open to belly rubs, ear skritches, and full-body hugs. Even if they wanted to, bullmastiffs couldn’t disguise their adoration since it’s difficult to ignore 130 pounds of love coming your way!

Breeders Stonebull Bullmastiffs in Swanzey, New Hampshire are owned by Steve Krulish and Jackie Smith. According to Smith, bullmastiffs “are intensely loyal with long memories.” Instead of feeling the urge to have doggie friends, they appear to yearn for human company.” Thus, to ensure that this handsome dog has an amazing life with you, give him good training and take care of him great tenderness toward him.


bullmastiff puppies

bullmastiff puppies

A bullmastiff is a handsome dog, huge and muscular, with a high-castled gaze and a focused stare. His large shoulders, sloping hindquarters, and deep chest are all supported by his strong, broad legs. His mastiff progenitor gave him a square, muscular frame that wiggles slightly when his tapered tail whips at full speed.

The folds over his truncated black cube of a muzzle and the lines on his forehead bear witness to his bulldog heritage. Actually, he’s not quite as depressed as he seems. However, in typical bully form, his wide, deep-set brown eyes seem a little forlorn, and his jowls dangle with a faint scowl.
The short, thick, and smooth coat of a bullmastiff is often fawn or red, with black highlights surrounding his eyes and drawing ink on his ears, which form a V and extend down the side of his cap.
Weight-wise, males weigh 110–130 pounds, while females weigh 100–120 pounds. A bullmastiff approaches you from hip height or above, putting his head under your hand for comfortable pats. Withers measuring 27 inches is rather typical for this huge working dog type.



Within the massive frame of a bullmastiff dog lies a calm snuggle bug that longs for your companionship. Although every dog has a different personality, a bullmastiff usually wants to be in the same room as you, and he may even spend as much time as possible by your feet, beside you, or even on you.

However, this is not an automatic action. A bullmastiff, like many other working dogs and canines in general, can reach his full potential with effective no-fear and positive reinforcement training. This can begin as early as 10 weeks of age, once the dog has received all of his vaccines. “It’s been our experience that it takes a certain kind of human temperament for a bullmastiff to thrive in a family environment,” Smith explains. “Those who are at ease with establishing reasonable goals for training and conduct, as well as consistently follow through, would be ideal.”

Even with a submissive and kind disposition, a bullmastiff nevertheless has over 100 pounds of dog energy, which needs to be controlled with tender but strong supervision. Early on in a bullmastiff’s training, limits should be established. Puppy kindergarten and socialization training are just the beginning of training. Maintain his training by giving him frequent refresher classes to ensure he always knows he isn’t the family’s leader.

The Florida Veterinary Behavior Service’s Krista Sirois, DVM, stresses the value of socializing your bullmastiff to develop a positive outlook on life, believing that new people, animals, and circumstances are all positive.

“In all breeds, socialization is tremendously important, but with a 120-pound dog, there’s just an extra layer “Sirois claims. “You want to make sure you know that your dog has good manners and that they’re not afraid of things.”

Bullmastiffs, according to Smith, “have a hard time with ‘no,’ sometimes meaning’maybe.'” In that sense, they are usually rather literal. Being inconsistent creates unjust expectations on them and the family.” According to her, they’re not the ideal breed for people who are new to owning dogs.

Bullmastiffs are not considered working dogs because they do not require a lot of daily exercise to stay in good health and behave themselves. Taking your bullmastiff for daily walks and rewarding excellent behavior should help keep them happy. But it’s imperative to train him as a therapy dog or use agility sports and tracking games to harness his intelligence and innate ability.

Bullmastiffs are renowned for being comparatively silent hounds that rarely bark despite their gentle big nature, bullmastiffs are excellent watchdogs. He’s committed to his family and will let you know if something appears off. He has a history of searching for poachers by strolling across big country estates with gamemasters. Like any dog, your bullmastiff needs to be socialized to everyone, even strangers, in order to develop polite behavior.

Living Needs

Bullmastiffs should only be left off-leash in their own home. They require a fenced-in area where they can exercise. He could live happily in an apartment if he is taken outside several times a day to stroll and smell, as he is not as gregarious as other working breeds.

However, keep an eye on how much exercise they receive; just like with other large dog breeds, they may exercise excessively, particularly in their early years when they are still growing. “You’re not looking for them to be a marathon partner,” adds Sirois. “It’s not good for them to have repetitive, stressful strain on the joints.” Therefore, if you’re seeking for a running partner, this large man might not be the for you. But he will love taking long, leisurely walks.


Since bullmastiffs dislike hot, muggy weather, make sure you have a cool spot for him to relax in. Select chilly mornings or evenings for your steady walks so they don’t overdo it while they exercise, especially during the hottest part of the summer.

Due to their size, some owners may be reluctant to allow their bullmastiffs to socialize at dog parks, particularly with the tiniest dogs (think Yorkies or Chihuahuas). Bullmastiffs do have strong prey drives, but according to Sirois, they weren’t designed to be violent toward other dogs, so as long as they receive the right care and socialization from a young age, they should get along well with other dogs.

I see dogs who can be uncomfortable around other dogs every single day, adds Sirois Sometimes there’s a genetic factor, but often it’s just poor education.



Although a bullmastiff won’t require much maintenance, his slobber and flatulence may make him an unsuitable roommate. He has a flat face, or brachycephalic dog, and drools a lot. He also has digestive issues from the manner he eats, which releases unpleasant smells. A veterinarian can offer you tips on how to clean the folds on his mask, clean up spills, and propose foods for, well, other things.

Your puppy will grow until he is approximately two years old, and he will grow quickly. To help preserve his joints, Sirois advises giving him large breed puppy food rather than standard puppy food.

He will shed occasionally, particularly in the spring and fall, but a fast weekly brushing will keep he was tidy and neat. If his scent is a little off, give him a bath. Regular dental care, nail clippings, and ear examinations help to maintain a bullmastiff’s attractive appearance.


Like many huge dogs, a bullmastiff is very affectionate, but only for a limited period of time. He has a lifespan of seven to nine years. And there aren’t many medical issues to be aware of, much like with dogs of his size.

Bloat is one of the most important things to watch out for. All huge, deep-chested dogs are susceptible to this illness, according to Sirois, and it can be fatal. Among other reasons, bloat necessitates immediate surgery so a veterinarian can untwist the stomach. There aren’t many helpful recommendations other than being aware that it could happen. recognize the warning indicators and understand when to act quickly.”

As a prophylactic against bloat, Sirois advises owners of these huge breeds to tape their dogs’ stomachs. She advises having your bullmastiff checked for hypothyroidism, progressive retinal atrophy, and any other possible health concerns. Bullmastiffs and other large dogs are also susceptible to elbow and hip dysplasia, which is a degenerative joint disease that is painful and typically inherited. While medication may be helpful initially, later stages frequently require surgery. Seek advice from a veterinarian regarding fitness regimens, age-related testing, and genetic factors.
Bullmastiffs, often known as the “Gamekeeper’s Night Dog,” were first developed in England in the middle of the 1880s as gamekeepers on large country estates found it difficult to prevent poachers from stealing. Since poaching was illegal, most landowners preferred to apprehend poachers rather than manipulate them. The idea was to breed a dog with an even temperament that was swift and forceful. The ABA claims that crossing mastiffs with bulldogs produced an impressive animal that could sprint quickly, track stealthily, and pin down an intruder until the gamekeeper came to remove him. The cleverness of this unique dog saved the lives of both poachers and gamekeepers.

These magnificent dogs quickly made their way onto the British competition scene, where gamekeepers competed to boast about their bullmastiffs’ prowess and powerful presence. Bullmastiff breed enthusiasts sought for accreditation with England’s Kennel Club, which was awarded in 1924, as dog shows gained popularity in the early 1900s.

Oil tycoon John D. Rockefeller brought bullmastiff dogs to the United States in the 1920s. He desired for them to wander the grounds of his country house, Kykuit, located in New York’s Hudson River Valley. A result of the East Coast elite’s infatuation with this new canine, purebred bullmastiffs were officially recognized by the American Kennel Club in 1933.

The first distinction between English mastiffs and bullmastiffs is size, in case you were wondering. Bullmastiffs weigh around 100 pounds less than English mastiffs. Additionally, English mastiffs’ bodies aren’t as “square” as those of bullmastiffs. Other besides that, their temperaments are identical, they are both descended from the enormous ancient molosser, and they are both excellent family dogs.

Fun Facts

Numerous well-known owners, including musical sensation Christina Aguilera, movie actor Marlon Brando, rocker and philanthropist Jon Bon Jovi, and folk legend Bob Dylan, are also owners of Bullmastiffs.
Butkus the bullmastiff, Sylvester Stallone’s cherished pet, made two appearances in the 1976 film Rocky and Rocky II.
The mascot of the NFL team Cleveland Browns is a bullmastiff named SJ. When his father Swagger retired in 2019 after five years of bringing football players out of the tunnel on game days, he succeeded him.



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