How brachycephalic calorie math actually works
Most online calorie calculators use a one-size-fits-all formula based on Resting Energy Requirement (RER = 70 × bodyweight_kg^0.75). For brachycephalic breeds, that formula is dangerously generous. Pugs and French Bulldogs have lower lean-muscle-to-fat ratios, slower metabolic rates, and — critically — a documented genetic predisposition to weight gain.
This calculator applies three brachy-specific adjustments. First, we calculate calories based on your dog's target weight (not current weight) so the math actively pushes toward a healthy body condition. Second, we apply an 88% multiplier to account for the reduced metabolic activity typical of flat-faced breeds. Third, we recommend treats stay under 10% of total calories — which for most Pugs means a single dental chew, not three.
Use the result as a starting point. Re-weigh your dog every two weeks and adjust by ±5% based on whether you're hitting your weight loss or maintenance target. For dogs with diagnosed BOAS, even small weight reductions can produce dramatic improvements in breathing — one of the highest-leverage interventions you can make at home.