How ideal weight is estimated
Each BCS point above 5 represents approximately 10–15% excess body fat. The formula:
Ideal weight ≈ Current weight × [1 − ((BCS − 5) × 0.10 to 0.13)]
The percentage per BCS point varies slightly by breed size — toy breeds carry less raw fat per BCS point, while giant breeds carry more.
A safe rate of weight change
Target 1–2% of body weight per week. Faster loss often comes from muscle, not fat.
Why ideal weight matters more than total weight
Weight alone is meaningless without context. A 9 kg Westie might be perfectly healthy; another in a body that's "supposed to" carry 7 kg is dangerously overweight.
TipUse the ideal weight (not current weight) in the calorie calculator when planning a weight-loss diet.
Frequently Asked Questions
Is the ideal weight estimate exact?
It's a planning estimate within roughly ±10%. The true ideal is found through re-assessing BCS every 2 weeks during the weight change.
My dog is BCS 5 — should I still use this?
If your dog is at BCS 5, current weight equals ideal weight. Use the Calorie Calculator to maintain.
What if my dog has a medical condition?
Hypothyroidism, Cushing's disease, arthritis, and certain medications affect ideal weight. Always work with a veterinarian.