Bullmastiff
Great Britain, Molossian type
- Size
- Giant
- Height
- 61–69 cm
- Weight
- 41–59 kg
- Life expectancy
- 7–10 yrs
- Calm
- Loyal
- Protective
- Confident
Heights and weights are typical adult ranges; individual dogs vary.
About the Bullmastiff
The Bullmastiff is a large British guard dog developed in the nineteenth century by crossing mastiffs and bulldogs, originally to help gamekeepers deter poachers on estates. It has a powerful, muscular build, a broad head with a short muzzle and a short coat in fawn, red or brindle. Today it is mostly a family guardian and companion.
Temperament
Typically calm, loyal and quietly confident, with a strong protective instinct. It is usually affectionate with its family but wary of strangers, and it needs early socialisation and firm, gentle handling.
Exercise
Needs moderate daily exercise, such as steady walks. Avoid strenuous exercise in hot weather and in growing puppies.
Grooming
The dense short coat, in fawn, red or brindle, needs a weekly rub with a rubber brush. Wipe the dark muzzle and slobber around the lips when it gets messy.
Care & wellbeing
Giant, heavy breeds benefit from careful growth, healthy weight and joint care.
Daily needs at a glance
For a typical 50 kg adult- Water
- 2 L–3 L
- a day
- Energy
- ≈ 2,110 kcal
- a day, neutered adult
- Exercise
- 30–60 min
- a day
- Grooming
- An occasional brush is plenty
Starting points from the same formulas as our calculators. Your pet's age, weight, activity and food all change the numbers. Work it out for your pet
Living with a Bullmastiff
Typical tendencies for the breed. Upbringing, training and the individual matter as much.
History
A British guard dog developed on country estates in the nineteenth century by crossing mastiffs with bulldogs, to guard land against poachers. It combines size with a fairly calm, loyal temperament and is today kept as a family guardian and companion.
Health
The breed can be prone to
- Hip and elbow dysplasia
- Cancers
- Bloat (gastric dilatation-volvulus)
- Eye problems
Health tests to ask a breeder about
- Hip and elbow scores
- Eye tests
- Heart check
Not every Bullmastiff is affected, and this isn't a diagnosis. Read about common conditions and when to see a vet.
Cost to keep
Highest than average- Food, insurance and medicines cost more for a big dog
- Little or no professional grooming needed
- A 7–10 year commitment
- Budget for breed-related health checks or insurance
A relative guide, not a price — costs vary a lot by country, insurer and lifestyle.
Is a Bullmastiff right for you?
Could suit
- Calmer households and owners who prefer gentle walks
- People who'd rather not spend much time grooming
Think twice if
- Space, food and vet costs are a concern — giant breeds need more of all three
- You live somewhere hot or want a very active companion — flat-faced breeds can struggle with breathing and heat
Not sure? Try the breed finder or read choosing the right dog breed.
Common questions
How big does a Bullmastiff get?
Adult Bullmastiffs typically stand about 61–69 cm at the shoulder and weigh around 41–59 kg. Individuals vary, and males are often larger than females.
How long do Bullmastiffs live?
Typically 7–10 years. Keeping them lean, active and up to date with vet checks gives the best chance of a long, healthy life.
How much exercise does a Bullmastiff need?
As a guide, around 30–60 minutes a day, split between walks, play and sniffing time. Puppies and older dogs need shorter, gentler sessions.
How much grooming does a Bullmastiff need?
An occasional brush is plenty. Check ears, teeth and nails as part of the routine.
Are Bullmastiffs easy to train?
Generally trainable with consistent, reward-based practice.
Do Bullmastiffs shed?
A little. Regular brushing keeps loose hair under control.
Are Bullmastiffs good with children?
Many get on well with children. Always supervise young children with any dog, and teach them to give the dog space.
Can a Bullmastiff live in a flat?
It's usually a challenge — as long as they get enough daily exercise and time outdoors.
What health problems do Bullmastiffs have?
The breed can be prone to hip and elbow dysplasia, cancers, bloat (gastric dilatation-volvulus). Not every Bullmastiff is affected — ask a breeder about health testing, and your vet about what to watch for.
Written by Petopedia as general guidance, not veterinary advice. Ask your vet about health screening for this breed.
Breed details
- Country of origin
- Great Britain
- Type
- Molossian type
- Internationally recognised
- 1955