Best dry dog food for a Bullmastiff
A Bullmastiff is a large, heavily built dog, often 50kg or more fully grown, and the two things that matter most in a dry food are a large-breed formulation that supports joints during growth, and careful portion control throughout life, since this breed carries a lot of weight on a frame that works hard from puppyhood onward.
Feeding a Bullmastiff
A large breed
An adult Bullmastiff typically weighs 41–59kg, so a healthy Bullmastiff eats a fair amount compared with other breeds. Every feeding guide on a bag is written per kilo of body weight, not per breed — start there, then adjust to the dog in front of you.
Life stage
A large breed is usually done growing at 15–18 months, which is roughly when a puppy food has finished its job. With a typical lifespan of 8–10 years, there is a long adult stretch in the middle; switch to a senior food when your vet thinks it is worth it rather than on a birthday.
Joint support is worth looking for
Their size and frame put more load through the joints than a smaller dog carries, so a food with joint support on the label is worth reading for — and keeping them lean does more for their joints than any supplement.
Weight matters more than usual here
A long back or a heavy frame makes every extra kilo count twice. Weigh portions rather than eyeballing a scoop, and reduce the food rather than the walks if the waist starts to disappear.
This breed tends to bolt its food
A food-motivated dog will empty a bowl in under a minute given the chance. A slow feeder or a puzzle bowl turns a meal back into something that takes time, and splitting the daily ration across two or three meals helps as well.
A shallow, wide bowl suits a flat face
A flat-faced dog cannot reach into a deep bowl without pressing its nose into the sides, which is uncomfortable and makes it gulp air. A shallow bowl, and food that does not have to be chased around it, is the easier arrangement.
How much should a Bullmastiff weigh?
Adult 41–59kgfully grown at 15–18 months
| Age | Stage | Typical weight | Of adult size |
|---|---|---|---|
| 8 weeks | Just home | 4.7–6.7 kg | 11% |
| 3 months | Young puppy | 7.6–11 kg | 19% |
| 6 months | Growing fast | 15.2–21.9 kg | 37% |
| 12 months | Adolescent | 30.5–43.8 kg | 74% |
| 15–18 months | Fully grown | 41–59 kg | 100% |
A guide, from the same rule of thumb our puppy growth predictor uses — each age is that share of the way to maturity for a large breed. Puppies grow fastest early, so a real puppy usually sits a little above the middle rows. Weigh yours and ask your vet if the number worries you.
Complete dog foods that suit a Bullmastiff
Complete foods from our range, matched to a Bullmastiff's size band and what the breed typically needs. Stock levels and delivery dates are live on each product.
Field & Trial Skinner S Field Trial Light Senior
A lower-fat dry food for older, overweight or less active dogs, including working breeds
From£9.85
Autarky Complete Grain Free Adult Turkey
Grain-free complete dry food for adult dogs, with turkey and a marine-algae joint care package
£12.79
Autarky Grain Free Tasty White Fish & Potato Complete
Grain-free dry dog food built around white fish meal rather than poultry
£12.99
Lily's Kitchen Lily S Kitchen Dog Lovely Lamb
Complete lamb-led dry dog food offered in two practical bag sizes
From£25.15
Burns Adult Large/Giant Breed Chicken and Brown Rice
Complete large-breed dry dog food with 23% chicken and brown rice
£59.99
Burgess Greyhound and Lurcher Chicken
Complete adult dry food formulated for the specific build of greyhounds and lurchers
£35.35
Naturo Senior Rice Poultry Variety 6pk
Six 400g trays across three recipes for senior dogs, with glucosamine and chondroitin
£10.29
Naturo Senior Dog Turkey with Rice and Vegetables 7pk
Turkey at 65% in a senior wet tray, with brown rice, vegetables and added joint support
£11.99
Vitalin Adult Dog Pork with Apple
Complete dry food for adult dogs of any age, led by pork, with citrus extract for dental support
From£11.99
Why large-breed formulation matters
Large and giant breeds like the Bullmastiff grow fast and heavy, and a puppy food formulated specifically for large breeds is built with a controlled calcium and calorie balance to avoid the puppy growing too quickly for their developing joints. Growing too fast is a genuine risk factor for joint problems later in life in breeds this size, which is why the large-breed label on a puppy food is worth paying attention to rather than treating as marketing.
As an adult, the same underlying principle continues: a Bullmastiff carries a lot of body weight on its joints every single day, so a food that supports a lean, appropriate body condition does more for their long-term comfort than almost anything else in their diet.
Joint support as they age
Bullmastiffs are among the breeds more commonly affected by joint conditions such as hip dysplasia, partly due to their size and partly due to genetics within the breed. Some adult and senior dry foods include added glucosamine and chondroitin aimed at supporting joint health, and a dedicated joint supplement is also worth discussing with a vet, particularly once a dog is showing any stiffness.
Keeping a Bullmastiff at a lean, healthy weight throughout life is, in practical terms, one of the most effective things an owner can do for their joints — every extra kilo of body weight adds meaningful strain to hips and elbows that are already working hard in a dog this size.
Portion control for a large, food-motivated breed
Bullmastiffs are often enthusiastic eaters, and it is easy to overestimate how much a dog this size actually needs relative to their size, particularly once they are past their growth phase and less active than a working or sporting breed. Weigh food out against the pack's guide for your dog's actual weight, rather than a generic 'large dog' assumption, and adjust based on body condition rather than appetite alone.
Splitting meals across the day, rather than one large feed, is also worth considering for deep-chested breeds like the Bullmastiff, since it is a sensible general precaution for breeds prone to bloat, alongside avoiding vigorous exercise immediately after eating.
Common questions
- Should a Bullmastiff eat a large-breed specific food?
- As a puppy, yes — large-breed puppy foods are formulated to support slower, controlled growth that suits a dog reaching this eventual size. As an adult, a large-breed adult food is a sensible choice too, though what matters most day to day is portion size matched to your individual dog's weight and activity.
- How much should an adult Bullmastiff eat a day?
- This depends heavily on the specific food's calorie density, your dog's exact weight and how active they are, so always start from the feeding guide on the pack for your dog's weight rather than a generic figure, and adjust based on their body condition over time.
- Are Bullmastiffs prone to bloat?
- Deep-chested large breeds, Bullmastiffs included, are generally considered at higher risk of bloat than smaller or narrower-chested breeds. Feeding smaller, more frequent meals and avoiding strenuous exercise straight after eating are commonly recommended precautions, and it is worth discussing bloat risk specifically with a vet.
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Written by Matt Garnett, who runs Giddy Pets and is a lifelong pet owner — not a vet. This is general information, not veterinary advice, and it cannot replace an examination by the vet who knows your animal. How we write these guides.