About the Mastiff
Enormous, mellow guardians — one of the heaviest dog breeds. A typical adult Mastiff weighs around 70–100 kg (Giant).
How many calories does a Mastiff need?
Calorie needs use the veterinary formula 70 × weight(kg)0.75 (the Resting Energy Requirement), multiplied by a lifestyle factor of ×1.6 for a typical dog at the life stage shown. Enter your own animal's details in the calculator for an exact figure.
| Body weight | Daily calories | Dry kibble ~3,500 kcal/kg | Wet ~1,050 kcal/kg |
|---|---|---|---|
| 70 kg | 2710 kcal | 774 g | 2581 g |
| 74.286 kg | 2834 kcal | 810 g | 2699 g |
| 78.571 kg | 2956 kcal | 844 g | 2815 g |
| 82.857 kg | 3076 kcal | 879 g | 2929 g |
| 87.143 kg | 3194 kcal | 913 g | 3042 g |
| 91.429 kg | 3312 kcal | 946 g | 3154 g |
| 95.714 kg | 3427 kcal | 979 g | 3264 g |
| 100 kg | 3542 kcal | 1012 g | 3373 g |
Feeding a Mastiff for a healthy weight
Mastiffs are at bloat and joint risk; split meals, avoid post-meal exercise, and keep them lean, since every excess kilogram is a heavy load on giant joints.
What to feed a Mastiff
Dogs are facultative carnivores: they thrive on meat-forward diets but can use carbohydrate and plant matter. A complete-and-balanced food (dry, wet, fresh, or properly-formulated raw) meeting AAFCO or FEDIAF standards should make up the vast majority of intake, with treats capped at 10% of daily calories.
Most adult dogs do best on two meals a day. Puppies under four months need three to four smaller meals; large-breed puppies should be fed a large-breed-specific formula to slow bone growth and protect their joints.
Frequently asked questions
How much should I feed a Mastiff?
A 90 kg Mastiff needs roughly 2,500-3,000 kcal a day at normal activity, split across two or three meals to reduce bloat risk. Giant breeds are metabolically efficient, so this is less per kilogram than smaller dogs.
How much should I feed my dog per day?
A 10 kg neutered adult dog at a healthy weight needs roughly 500-560 kcal per day — about 150-165 g of standard dry kibble split over two meals. Scale up or down with weight, activity and life stage using the calculator above.
Should I feed my dog once or twice a day?
Twice a day suits most adult dogs and helps regulate appetite and blood sugar. Puppies need three or more meals; some giant breeds prone to bloat also do better with smaller, more frequent meals.