Mastiff Nutrition Guide
Updated 2026-05-08 · Vet-reviewed breed-specific guidance
Daily calories (avg)
2234 kcal
Protein target
23%
Fat target
12%
Activity level
low
Quick facts
- Size: giant
- Adult weight: 120–230 lbs
- Lifespan: 6–10 years
- Activity: low
Best foods for Mastiffs
- Large-breed formula
- Lean meats
- Brown rice
Foods to avoid for Mastiffs
- Excess calories
- 1 huge meal/day
Diet considerations & watch-outs
- Slow growth essential
- Bloat HIGH risk
- Joint support critical
Common health concerns
- Bloat
- Hip dysplasia
- Heart disease
How we calculate calories
We use the standard veterinary RER (Resting Energy Requirement) formula: 70 × (weight in kg)^0.75, multiplied by an activity factor. For a 175-lb Mastiff at low activity, that's approximately 2234 kcal per day. Puppies need 2x maintenance; seniors typically 0.8x.