Bullmastiff Feeding Guide
Published by DosageGuide · Reviewed
How much to feed your Bullmastiff, daily calories, portion sizes, and feeding schedule
The Bullmastiff, a giant breed hailing from England, sits at #101 on the AKC popularity chart. Created in 19th-century England by gamekeepers who crossed Bulldogs with Mastiffs to produce a dog that could catch and hold poachers without mauling them. Bred for physically demanding tasks like guarding, hauling, and rescue, the Bullmastiff is a powerful giant breed from the Working Group. Fueling their muscular frame requires attention to protein quality, calorie density, and joint-supporting nutrients. An adult Bullmastiff needs between 1652 and 2011 calories per day, though this varies with age, weight, activity level, and individual metabolism.
An adult Bullmastiff weighing 100 to 130 lb needs about 1652 to 2011 kcal a day, around 1834 kcal for a neutered dog at a healthy weight with moderate activity. On a dry food of 380 kcal per cup that is 4.3-5.3 cups daily, roughly 454 to 559 grams, split into two meals; on wet food alone, 6.6-8 cans of 250 kcal; on a raw diet, 32-62 oz of food, about 2-3% of body weight. Weigh the ration rather than measuring it by cup, since kibble density varies by up to a third between brands, count treats inside that total rather than on top of it, and keep them under ten per cent of the calories. A Bullmastiff that gains or loses weight on these amounts needs a vet's opinion, not simply a different scoop: these figures are a starting point for a healthy dog, and they assume the 7-to-9-year life stage and activity level described below rather than pregnancy, illness or working days.
Two of the conditions this breed is screened for change how it should be fed, and the less common one matters more here because it is the one a general feeding guide never mentions. With gastric dilatation-volvulus, this is the one condition on the list that kills within hours, and the feeding rules are the whole prevention: two or three small meals instead of one, water available but not gulped after food, and no running immediately after eating. With elbow dysplasia, lameness after exercise rather than during it is the usual sign, and the feeding lever is the same as for any joint condition, which is keeping the dog at the lean end of its range. Neither is a reason to choose a different food off the shelf; both are reasons to weigh the ration rather than estimate it.
A third predisposition worth knowing is hip dysplasia: every excess pound is carried by the joint, so the body-condition score matters more here than in a breed without the predisposition, and a dog kept one rib-width leaner has measurably less pain over its life. A Bullmastiff that never develops any of these still benefits from the same habits, because the habits are simply good feeding practice made specific.
A short coat makes body condition visible, which is the one advantage that matters at feeding time: the waist and the ribs can be seen and felt without parting fur, so the weekly check takes seconds and needs no scale. For a Bullmastiff, that is the check worth making weekly.
Males and females of this breed differ enough in size that one ration does not fit both: around 115 lb against 100 lb on average, a gap of 16 per cent. Feeding both from the same scoop overfeeds one and underfeeds the other, and the figures on this page should be read against the dog in front of you rather than against the breed average.
Plan on 1.5–2.6 cups of premium dry food daily for your adult Bullmastiff, divided into morning and evening meals. Given this working breed's predisposition to Lymphoma, discuss dietary approaches that may help manage this risk with your vet. Males weigh 110-130 pounds, females 100-120 pounds; the breed should be powerfully built but not excessively heavy or lacking in agility..
Daily Calorie Needs for Bullmastiff
Adult
1652-2011
kcal/day
Puppy (peak)
2080
kcal/day (6-9 mo)
Senior
1468-1787
kcal/day
Note: Feeding guidelines are estimates based on standard veterinary formulas. Every dog is different, consult your veterinarian for personalized advice.
Feeding Strategy for Bullmastiffs
With a calm, low-energy temperament, the Bullmastiff is particularly susceptible to overfeeding. Their daily requirement of 4.3-5.3 cups may seem surprisingly small, but exceeding it regularly leads to weight gain. A weight-management or light formula can help, and measuring every meal with a proper cup, not estimating, is essential for this breed.
Bloat Prevention for Bullmastiffs
Bullmastiffs are predisposed to Gastric Dilatation-Volvulus (commonly known as bloat), one of the most serious emergencies in veterinary medicine. The stomach fills with gas and can twist on itself, cutting off blood supply. How you feed your Bullmastiff directly impacts this risk. Deep-chested breeds like the Bullmastiff are anatomically more susceptible, but proper feeding practices significantly reduce the odds.
Essential Feeding Practices
- Divide daily food into 2-3 smaller meals instead of one large feeding
- Use a slow-feeder bowl to prevent gulping air while eating
- Avoid vigorous exercise for at least 30-60 minutes before and after meals
- Keep your dog calm during and after mealtimes, excitement increases air swallowing
- Consider moistening kibble with warm water to reduce expansion in the stomach
- Feed from a raised bowl at chest height to reduce neck strain and air intake
Bullmastiff Feeding Schedule
Morning (7-8 AM)
2.2-2.7 cups kibble
Evening (5-6 PM)
2.2-2.7 cups kibble
Split Meals
Portion Sizes by Food Type
Daily Portions for Bullmastiff
Based on average adult weight and activity level
| Food Type | Daily Amount | Calories | Frequency | Notes |
|---|---|---|---|---|
| Dry Kibble | 4.3-5.3 cups | 1652-2011 kcal | 2 meals/day | ~380 kcal per cup |
| Wet Food | 6.6-8 cans | 1652-2011 kcal | 2 meals/day | ~250 kcal per 13oz can |
| Raw Diet | 32-62 oz | 1652-2011 kcal | 2 meals/day | 2-3% of body weight |
- Amount
- 4.3-5.3 cups
- Calories
- 1652-2011 kcal
- Frequency
- 2 meals/day
~380 kcal per cup
- Amount
- 6.6-8 cans
- Calories
- 1652-2011 kcal
- Frequency
- 2 meals/day
~250 kcal per 13oz can
- Amount
- 32-62 oz
- Calories
- 1652-2011 kcal
- Frequency
- 2 meals/day
2-3% of body weight
Exercise & Feeding for Bullmastiffs
The Bullmastiff has modest exercise needs, 20-30 minutes of gentle walks and indoor play daily is usually sufficient. Because of their low activity level, there is rarely a need to adjust food intake for exercise. The bigger risk is overfeeding a relatively sedentary dog. If your Bullmastiff gets less activity than usual (bad weather, recovery from illness), consider reducing portions by 10%.
Joint Health & Nutrition
Joint health is a primary nutritional concern for Bullmastiffs, which are predisposed to Hip Dysplasia and Elbow Dysplasia. Diet plays a preventive and management role at every life stage. For puppies, controlled growth rate and proper calcium-phosphorus ratios protect developing joints. For adults, maintaining ideal body weight reduces mechanical stress on joints. Specific nutrients can slow cartilage degradation and reduce inflammation.
Recommended Joint Supplements
Common Feeding Mistakes to Avoid
Overfeeding because the Bullmastiff always seems hungry
Some breeds appear perpetually hungry due to genetics or behavior. Stick to measured portions and use low-calorie treats like baby carrots, green beans, or ice cubes. If your Bullmastiff inhales food, try a slow-feeder bowl.
Using a puppy formula designed for small breeds
Large and giant breed puppies need controlled calcium and phosphorus levels to prevent developmental orthopedic diseases. Always choose a large-breed puppy formula that supports slow, steady growth rather than rapid weight gain.
Feeding one large meal per day
Bullmastiffs are at risk for bloat (gastric dilatation-volvulus), a life-threatening emergency. Always split daily food into 2-3 smaller meals and avoid exercise immediately after eating. Consider an elevated bowl and a slow-feeder.
Skipping joint supplements until problems appear
For breeds predisposed to joint issues, preventive supplementation with glucosamine and omega-3 fatty acids can help protect cartilage before damage occurs. Starting these supplements early, even at 1-2 years old, is more effective than waiting for symptoms.
Letting the puppy grow as fast as possible
Giant breed puppies that grow too quickly are at higher risk for developmental bone and joint disorders. Feed a giant-breed puppy formula and aim for slow, steady growth, reaching full adult size at 18-24 months is healthier than hitting target weight at 12 months.
Bullmastiff-Specific Feeding Tips
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Tip 4
Tip 5
Tip 6
Breed-Specific Nutritional Needs
Based on health conditions common in Bullmastiffs, consider these nutritional adjustments:
Glucosamine & Chondroitin
Add a joint supplement with glucosamine (500-1000mg) and chondroitin. Consider foods with added omega-3 fatty acids (EPA/DHA) to reduce inflammation.
Meal Frequency
Feed 2-3 smaller meals per day instead of one large meal. Use a slow-feeder bowl. Avoid exercise 30 minutes before and after meals.
Bullmastiff Ideal Weight
Is your Bullmastiff at a healthy weight? The ideal range is 100–130 lbs (males 100–130, females 85–114). Check these three signs: Ribs: Easily felt with light pressure; not visible but not buried under fat. Waistline: A clear narrowing behind the ribs when viewed from above.
Male Bullmastiff
100-130 lbs
45-59 kg
Female Bullmastiff
85-114 lbs
39-52 kg
Related Guides
Feeding Guides for Similar Breeds
Frequently Asked Questions
An adult Bullmastiff typically needs 1652-2011 calories per day, which translates to approximately 4.3-5.3 cups of dry kibble daily, split into two meals. However, this is a starting point, your specific dog's needs depend on their exact weight within the 100-130 lb range, activity level, metabolism, and whether they're spayed/neutered (which reduces calorie needs by about 20-30%).
Adult Bullmastiffs should be fed twice a day, ideally 12 hours apart (morning and evening). Because this breed is at risk for bloat, splitting food into 2-3 meals is especially important, never feed the entire daily portion in one sitting. Consistent meal times help regulate digestion, blood sugar, and make house training easier.
Look for a food that lists real meat (not meal or by-products) as the first ingredient, contains 22-30% protein, and is formulated for giant breeds. Large breed formulas have controlled calcium (1.0-1.5%) and phosphorus levels to support skeletal health. Weigh the food rather than measuring it by cup: kibble density varies by up to a third between brands, so the same cup can hold 80 or 120 grams.
Given the Bullmastiff's predisposition to joint issues, consider: glucosamine HCl (500-1000mg/day), chondroitin sulfate, and omega-3 fish oil (EPA/DHA). Green-lipped mussel extract is also showing promise in studies. Many premium dog foods already include glucosamine, check your current food's label before adding supplements. Start joint support early (1-2 years old) for prevention rather than waiting for symptoms to appear. Always consult your vet before starting a supplement regimen.
Giant breed puppies like the Bullmastiff should stay on a large/giant breed puppy formula until 18-24 months. Their skeletal system continues developing much longer than smaller breeds. The key is not to switch based on size alone, your puppy should be at or near their expected adult height. Transition gradually over 7-10 days, mixing increasing amounts of adult food with decreasing amounts of puppy food. Choose a large-breed adult formula with appropriate calcium and phosphorus levels.
Bloat (GDV) prevention through feeding: divide daily food into 2-3 meals rather than one; use a slow-feeder bowl; avoid vigorous exercise 30-60 minutes before and after meals; keep meal times calm; consider moistening kibble with warm water; and don't let your dog drink excessive water immediately after eating. While no feeding method guarantees bloat prevention, these practices significantly reduce the risk in susceptible breeds like the Bullmastiff. Discuss prophylactic gastropexy with your vet, especially if you're getting a puppy.
Raw (BARF) diets are an option for Bullmastiffs, with proponents citing shinier coats, cleaner teeth, and better digestion. A typical raw diet provides 2-3% of body weight daily, for a Bullmastiff, that means roughly 32-62 oz per day. The diet should include muscle meat (70%), raw meaty bones (10%), organ meat (10%), and vegetables/fruits (10%). However, raw diets carry risks of bacterial contamination and nutritional imbalance if not properly formulated. Consult a veterinary nutritionist before switching.
A healthy adult Bullmastiff weighs between 100-130 lbs (males: 100-130 lbs, females: 85-114 lbs). Use the body condition score (BCS) method: you should be able to feel ribs with light pressure but not see them, observe a visible waist when viewed from above, and notice an abdominal tuck from the side. If your Bullmastiff exceeds 150 lbs or you can't feel the ribs, consult your vet about a weight management plan.
Feeding Guidelines Disclaimer
The feeding recommendations on DosageGuide.com are estimates based on standard veterinary nutrition formulas (RER = 70 × weight^0.75) and general guidelines from AAFCO and veterinary nutrition resources.
Every dog is unique. Actual calorie needs vary based on breed, metabolism, activity level, health conditions, spay/neuter status, and the specific food brand you use. Always consult your veterinarian for personalized feeding advice.
These guides are for general reference and do not replace professional veterinary guidance. Adjust portions based on your dog's body condition score and weight trends.