Bullmastiff Information

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(Bull Mastiff) The Bullmastiff is massively and powerfully built, but he is not cumbersome or awkward. Their backs are short, straight, and level between the withers and loin. Their large heads are broad and wrinkled and feature a comparatively short, square-shaped, dark muzzle that is about 1/3 of the length of their head. Their nose is black with large, open nostrils, and their eyes are medium-sized and dark hazel in color. Bullmastiffs have v-shaped, wide-set ears that are dark in color and pendant-shaped. Their teeth meet in a level or slightly undershot bite, and their tails are tapered and high-set. Bullmastiffs have a short-haired coat that is slightly rough in texture. It comes in a variety of colors including brindle, red, or fawn. Frequently, the coat of this breed will feature black markings on the head.

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The Bullmastiff is a loyal, devoted breed of guard dog that is always alert and protective. Although he is fearless and brave, the Bullmastiff is docile unless provoked. This breed will not attack just anyone, but they will catch intruders and knock them onto the ground. They do not bite and they are not aggressive unless directly threatened. Bullmastiffs have a good-natured, loving temperament, and they are tolerant of children. They are even-tempered, intelligent, and they crave human affection. Because of their large size and powerful presence, Bullmastiffs need a firm master. This breed should be trained for safety and should be socialized with other people and dogs from an early age. Bullmastiffs are generally reserved with strangers and they can be aggressive with other dogs. If raised with pets and animals, Bullmastiffs can learn to get along with other pets in the household. This breed tends to drool and snore.

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24 – 27 inches
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100 – 133 pounds
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General Health

Like many other larger dog breeds, the Bullmastiff is prone to hip dysplasia. Other concerns for this breed include tumors, eyelid problems, boils, and bloat. Bullmastiffs have a life expectancy of less than 10 years, and they average 8 puppies per litter.

This breeds life expectancy is 8-12 years.

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Developed in England in 1924, the Bullmastiff was obtained by crossing Bulldogs and Mastiffs. The Bullmastiff was initially utilized as a gamekeeper’s dog- to track down poachers and tackle them to the ground. Once the need for gamekeeper’s dogs decreased, the Bullmastiff was bred with a lighter, more desirable coat color. Initially the Bullmastiff was bred with a dark coat color to camouflage into the night. Today, the Bullmastiff is prized as a hunting guard, a police worker, an army aid, and a watchdog.

They are also used as Therapy Dogs.

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The Bullmastiff has a short-haired coat that is easy to groom and care for. This breed’s coat should be brushed with a firm bristle brush and shampooed only as necessary. Bullmastiffs shed little to no hair. The feet of this breed should be regularly checked and their nails should be kept trimmed.

Bull Mastiffs shed a medium amount of hair.

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Ideal Environment

Bullmastiffs have a tendency to become lazy, so frequent exercise is needed to maintain a healthy lifestyle. This breed should not be overfed. Bullmastiffs can live happily in a small household or apartment if they are given sufficient exercise. They are comparatively inactive indoors, and a small yard will do. Bullmastiffs cannot tolerate extreme climates.

Exercise should be limited in the first months of a Bullmastiffs life so that no strain is put on the joints and ligaments. Any activities that involve jumping and climbing stairs should be avoided.

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Dog Training!

If you're having problems training your dog or getting control, you should read our review of DogProblems.com. Adam will do whatever it takes to help you whip your dog into shape. I've used them to help with my Great Dane as well as help friends train their dogs. It's the first place I go to help answer users Questions. Many training issues are too extensive to answer in this forum, which is why I refer a lot of the load to his site. Update: I've been using and recommending DogProblems for three years now. I, as well as my users, value the techniques we've learned. I get weekly emails from users who have become better owners from the information they received.

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Bullmastiff Q&A

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my bullmastiff is 10 months old and his bottom jaw is covered in boiles and are starting around the top of his mouth what can i do about this?

possible allergic reaction to his dog bowls.... Use only stainless steel bowls - NO ceramic or plastic... will take a few weeks to clear up.....


I have a BM he is 8 months old. His back is 35 cm. And the front has not caught up yet. Im concerned with his back and hips. Is that normal to be that tall and he cant stand for long. He would rather lay down. He eats 2 meals a day 5 cups in the morning and 5 in the evening. He's not over weight. He looks under weight in the back. In the front its fine. By his tale the bones are sticking out. Im wondering if thats normal or if he has hip problems. He doesnt like to sit for long either.

Hi, I am a bulmastiff breader and have got many of my own. Would you mind sending me a picture to natalie.turner16@yahoo.co.uk and I will have a look at him and get back to you Thanks


I have a bull mastiff he is 22 mths he has boils on both of his hind legs what can i do about them and what causes them

You should get checked out by Vet but I know that it is common for the breed. My friends English Mastiff had cysts like boils he had it check out by vet and removed for vanity but when they did the vet had to remove more they thought they would have to and left him with a scare on his back so have vet check and if its nothing threatening, I would leave them. I have a female Bull mastiff and have no intention of cutting into unless its necessary


hi i have a 7 month old male bm he weighs 92 pounds but looks kind of slim he eats lots buy runs alot he is very active does 92 lb seem right?

what people seem to forget is that these "giant" breeds grow much slower then an average sized dog. feeding 5 cups of food at one sitting is far to much food to put into the stomach. do a little research on bloating and you'll understand why. with these "giant" breeds several smaller meals through out the day is the general recommendation. these dogs can grow well past 2 years of age, the important thing is to provide high quality foods, high in protein. ~and also lets not forget that although these dogs are heavy boned, they're going to have to keep carrying that 100+ lbs into their geriatric years, not every bully is meant to weigh in at 140lbs. a slim athletic build is not always a bad thing.


I have a beautifull 9mth old bullmastiff, but i think he might be a little smaller than what he should be, can u please tell me what the average weight and hight is for a 9mth old puppy, thanks

20 to 24 inches 30 to 45 kgs


what would the average size of my female bullmastiff be at the age of 6 months

mine is 45 pounds right now and the vet says it will be 100 pounds


Ok this is a simple question my bully was underweight i have started to give him a pint of full fat milk everyday aswell as 3 kg's of dry food every couple of days he gaining weight now but i want to no if the milk is doing him harm?

what sort of milk are you using? dogs can't digest cows milk properly. Goats milk is much better and will also help more with theweight gain


I presently have a 9 year old springer, who is very babied but usually get along well with other dogs. I am concerding adopting a 9 mon. bullmastiff. Do I have to worry about them getting along?

As long as you introduce them properly, they should do fine. I would be more worried about your springer getting along with the Bully rather than the other way around. We have a 14Mo old Bullmastiff who is best friends with our Maltese!! We introduced them when he was 3mos and the maltese was 6yrs, she was very upset with us at first but took to him almost right away. Just be sure to allow for time apart especially in the beginning, and keep in mind the pack mentality that they often work things out on their own. Bullies are known for being great with other dogs and people, but the more you find out about the new dog, the better. You know your springer, so trust your instincts!


I have an 11month old bullmastiff male, healthy and active weighing in at 100lbs ; is that the norm/average ?

The AKC states the normal Bullmastiff should be 110-130lbs full grown. However there isn't a standard to compare year-old dogs against, if your Bully appears to be healthy and active chances are he's normal weight. There are going to be males who are only 75 lbs at a year and some like ours who was 135lbs at a year (both can be considered ideal based on lineage). Typically they will continue to grow even beyond two years, at a year he should be showing max height but will continue to bulk up with muscle. Happy feeding!!


We have a year old Bullmastiff who started develping crusty rashes on his skin and losing small patches of hair about 4 mos ago, we brought him to the vet, who ran tons of tests for mange and other infections which all came back negative. She had asked if anything was new to the diet or environment he's in and we couldn't think of anything. We gave him all the allergy and skin pills she gave us in peanut butter as everyone recommends and the rashes flared up, turned out we had started him on some new PB treats and thats what it was a PEANUT BUTTER ALLERGY! Has anyone else heard of this typical to the Bully breed??

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