How much to feed a Bullmastiff: feeding chart by weight
A Bullmastiff usually weighs 100–130 lb. Here’s how much to feed per day, a feeding chart by weight and activity, and a puppy weight chart.
How much should a Bullmastiff eat per day?
An adult Bullmastiff weighing 100–130 lb eats about 5⅛–6¼ cups (522–636 g) of dry food a day if spayed or neutered with normal activity – that’s 1,958–2,383 kcal.
That’s for food with 380 kcal/cup (3,750 kcal/kg), using 1.6 × 70 × (weight in kg)^0.75 kcal from the Merck Veterinary Manual. Calculate with your own food right below.
Calculate with your food
How much does your dog weigh?
Decimals help, e.g. 22.5. No pet scale? Weigh yourself, then again holding your pet.
A starting point – the scale has the final say. If your dog is ill, talk to your vet.
Bullmastiff feeding chart by weight and activity
Dry food per day for spayed or neutered dogs, food with 380 kcal/cup (3,750 kcal/kg).
| Weight | Low activity | Normal | Very active |
|---|---|---|---|
| 100 lb | 4½ cups457 g | 5⅛ cups522 g | 5¾ cups587 g |
| 110 lb | 4⅞ cups491 g | 5½ cups561 g | 6¼ cups631 g |
| 120 lb | 5⅛ cups524 g | 5⅞ cups599 g | 6⅝ cups673 g |
| 130 lb | 5½ cups556 g | 6¼ cups636 g | 7 cups715 g |
A starting point – the scale decides: weigh your dog every two weeks and adjust the amount if it gains or loses. Intact dogs need about 12% more. “Low activity” and “very active” are our own simple steps (0.2 lower or higher factor).
How much does a Bullmastiff weigh?
- males
- 110–130 lb
- females
- 100–120 lb
The FCI and Royal Kennel Club standards give the same for males (50–59 kg, 110–130 pounds), but less for females: 41–50 kg, about 90–110 pounds.
Bullmastiff puppy weight chart and feeding amounts
A Bullmastiff grows to about 115 lb. Here’s what a puppy weighs at each age on the growth curve in the FEDIAF guidelines, and how much dry food with 380 kcal/cup (3,750 kcal/kg) it needs a day by the FEDIAF formula.
| Age | Weight | Dry food per day |
|---|---|---|
| 2 months | 19 lb | 3⅛ cups313 g |
| 3 months | 36 lb | 4½ cups461 g |
| 4 months | 48 lb | 5¼ cups533 g |
| 5 months | 58 lb | 5⅝ cups575 g |
| 6 months | 65 lb | 5⅞ cups601 g |
| 7 months | 72 lb | 6⅛ cups618 g |
| 8 months | 78 lb | 6¼ cups628 g |
| 9 months | 82 lb | 6¼ cups634 g |
| 10 months | 87 lb | 6¼ cups638 g |
| 11 months | 91 lb | 6¼ cups640 g |
| 12 months | 95 lb | 6¼ cups640 g |
Every puppy grows a little differently. Weigh your puppy every week; if it doesn’t gain steadily, talk to your vet. At 12 months, a puppy is only at about 82% of its adult weight on the curve: large and giant breeds may keep growing until 10–16 months, according to the Merck Veterinary Manual.
Bullmastiff feeding tips
What the sources say about feeding this breed. For health questions, talk to your vet.
- Puppy or adult food? Sources differ
According to the AKC, most Bullmastiff breeders advise feeding puppies an adult dog food or a large-breed puppy food, to ensure slow and steady growth. The Merck Veterinary Manual generally advises feeding large- and giant-breed puppies a growth diet made specifically for large breeds until they are fully grown. Both aim for the same thing: slow growth. Which food is right for yours is a question for your breeder and your vet.
- Several small meals, calm at mealtimes
Several small meals are best for puppies, and two meals a day is a good routine for adults, says the AKC, so the dog doesn’t have to digest too much at once. The AKC discourages exercise immediately before and after eating. So split the daily amount from the chart into meals.
- Keep them lean, especially as puppies
Bullmastiffs should be kept lean, especially as puppies, as they grow very rapidly, which can tax their systems, says the AKC. That fits with the Merck Veterinary Manual: slow growth is better than fast growth, and large-breed puppies fed only 50–70% of what their free-fed littermates ate grew just as tall, with less body fat. Weigh your puppy every week.
- How much exercise? Sources differ
Bullmastiffs enjoy daily exercise, says the AKC; some are more sedentary, others very active by nature, but moderate exercise such as brisk walks and outdoor play in a securely fenced area should be encouraged. They are not the ideal running partner, but great walking companions, and puppies should not be overexercised, especially during periods of rapid growth. The Royal Kennel Club, on the other hand, lists more than two hours a day. Choose the column by how much yours actually moves.
- No extra calcium
Don’t add calcium, phosphorus or vitamin D to a complete puppy food: according to the Merck Veterinary Manual, it’s rarely necessary and may even do harm. FEDIAF says too much calcium harms skeletal development in large breeds. If your vet advises otherwise, follow your vet.
Questions
How much should a Bullmastiff eat per day?
An adult Bullmastiff weighing 100–130 lb eats about 5⅛–6¼ cups (522–636 g) of dry food a day if spayed or neutered with normal activity – that’s 1,958–2,383 kcal. That’s for food with 380 kcal/cup (3,750 kcal/kg), using 1.6 × 70 × (weight in kg)^0.75 kcal from the Merck Veterinary Manual. Use the calculator above for your food.
How much does a Bullmastiff weigh?
According to AKC, adult males weigh 110–130 lb and females 100–120 lb. The FCI and Royal Kennel Club standards give the same for males (50–59 kg, 110–130 pounds), but less for females: 41–50 kg, about 90–110 pounds.
How much does a Bullmastiff weigh at 6 months?
About 65 lb on the growth curve in the FEDIAF guidelines, for an adult weight of 115 lb. Every puppy grows a little differently; the weight chart above shows every month from 2 to 12.
How much wet food does a Bullmastiff need?
A Bullmastiff weighing 115 lb, spayed or neutered with normal activity, needs about 72.5 oz of wet food with 30 kcal/oz or 5¾ cups of dry food with 380 kcal/cup a day. That’s about 2,174 kcal. Use the calculator above for your food.
My dog weighs more than this. Is that too much?
Not necessarily. The range is for typical dogs; large or muscular dogs can weigh more. Your dog’s shape tells you more than the number: you should feel the ribs and see a waist from above. If in doubt, ask your vet.
Sources
- AKC – Bullmastiff Dog Breed Information (Nutrition, Exercise)
- Royal Kennel Club – Bullmastiff breed standard (Size)
- Merck Veterinary Manual: Feeding Practices in Small Animals
- Royal Kennel Club – Bullmastiff (Breed characteristics: Exercise)
- FEDIAF Nutritional Guidelines 2025 (calcium for puppies p. 24, energy for growth p. 55)
Last checked: October 2026