How the dog-food energy model works
Metabolic body size uses the standard veterinary RER formula documented identically in the AAHA 2021
Nutrition and Weight Management energy box, the Pet Nutrition Alliance MER/RER handout, and WSAVA
nutrition tooling: RER = 70 × (body weight kg)^0.75.
Maintenance energy requirement is then MER = RER × factor,
where canine factors are taken verbatim from the AAHA 2021 table (neutered adult 1.4–1.6, intact 1.6–1.8,
inactive/obese-prone 1.0–1.2, weight loss 1.0, growth <4 months 3.0, growth ≥4 months 2.0, work light
1.6–2.0, moderate 2.0–5.0, heavy 5.0–11.0). Cups/day divide those kcal by the kcal/cup you type from the bag.
Why the answer is a range
When AAHA prints a factor band, we multiply RER by both ends and return a kcal/day span (then a cups/day span). That is intentional uncertainty from the guideline — not a bug and not a single false-precision ration. Your bag’s kcal/cup also varies by formula; we never invent a default kcal/cup.
Limits of this feeding estimate
- Factors are starting points; AAHA notes sedentary/indoor pets may need less.
- Body-condition score (BCS) adjustments are clinical — not automated here.
- Illness, lactation, and prescription diets are out of scope.
- Extremely low or high weights outside the form bounds are refused.
When to involve a veterinarian or nutritionist
Use a vet-guided plan for weight-loss programs, growing puppies on the 2.0–3.0× factors, working dogs on the high work bands, and any dog with pancreatitis risk or food allergies. Treat this page as math on published factors plus your label — not a diet prescription.
Dog food FAQ
- How is RER calculated?
- RER = 70 × (kg)^0.75; MER = RER × an AAHA 2021 canine life-stage factor.
- Why is the calorie answer often a range?
- Many AAHA factors are bands (e.g. 1.4–1.6×); both ends are applied to RER.
- Can this replace a veterinary nutrition plan?
- No — adjust with BCS and clinical judgment, especially for weight loss, growth, or heavy work.