Updated
Dog ideal weight calculator
Score your dog’s body condition on the 9-point WSAVA scale, and this page turns it into an ideal weight by the rule veterinarians use — each point above or below 5 is about 10 % of body weight — then into a safe timeline at the canine rate. Three steps most guides leave you to do alone.
54.9 lb, ideal weight
+20 % from ideal: lose 11 lb over 8.3–16.7 weeks at 1–2 % of body weight a week.
- Rule: each BCS point away from 5 ≈ 10 % of body weight (Laflamme 1997)
- 66 lb ÷ (1 + 0.1 × 2) = 54.9 lb
- Range (10–15 % per point)
- 50.7 lb to 54.9 lb
- Weeks to goal at 1–2 % a week (AAHA 2021)
- 8.3 weeks at the fast rate, 16.7 at the slow rate
- Next step
- Feed to the ideal weight, not today’s: the dog food calculator’s weight-loss mode takes the ideal weight and the WSAVA factor.
What this means
Body condition score is a hands-on measure, and it is what the ideal weight comes from — not the breed average, which says nothing about this animal’s frame. Feel for the ribs, look for a waist from above and a tuck from the side, and pick the score that matches the chart.
The 10 %-per-point rule is Laflamme’s approximation: her work found each point to be 10–15 % of body weight, which is why the range row exists. Safe loss for dogs is 1–2 % a week (AAHA 2021); several online tools quote the wrong unit or the wrong species.
Weight loss is planned on the ideal weight, not the current one: the diet’s calories come from the target weight’s resting energy, which is what the feeding calculator’s weight-loss mode does.
When to see a vet
- A score of 8 or 9: obesity at this level needs a supervised plan and a check for underlying disease.
- A score of 3 or below, or any dog losing weight without a diet change — thinness is a symptom before it is a feeding question.
- Weight changing faster than 1–2 % a week on any plan.
- A dog above score 7 from a breed prone to obesity (Labradors, Beagles, Dachshunds, Pugs), where joint and metabolic problems follow quickly.
Formula and sources
Sources reviewed 18 September 2026. Each names the figure it supports.
- The 9-point body condition score and the 10–15 % of body weight per point behind the ideal-weight rule — Laflamme D. P., "Development and validation of a body condition score system for dogs", Canine Practice 22(4), 1997; and "… for cats: a clinical tool", Feline Practice 25(5–6), 1997
- The body condition score descriptors beside the selector (dog) — WSAVA Body Condition Score chart, dogs
- The body condition score descriptors beside the selector (cat) — WSAVA Body Condition Score chart, cats
- Safe weekly loss (dogs 1–2 %, cats 0.5–1 %) and planning the diet on the ideal weight — AAHA Nutrition and Weight Management Guidelines for Dogs and Cats, 2021
This page is an educational estimate, not veterinary advice.
Frequently asked questions
What should my dog weigh?
Score the body condition on the 9-point scale, then divide today’s weight by 1 plus 0.1 for every point above 5 (or 1 minus 0.1 for every point below). A 66 lb dog at score 7 has an ideal weight of about 54.9 lb.
How do I body-condition score my dog?
Run your hands along the ribs: at an ideal 5 they are easy to feel under a thin layer of fat, like the back of your hand. From above there is a visible waist behind the ribs; from the side the belly tucks up. If you have to press to find ribs, the score is 6 or more; if you can see them, 4 or less. The WSAVA chart in the sources shows every score.
How fast can a dog lose weight safely?
About 1–2 % of body weight a week (AAHA 2021). A 30 kg dog with 5 kg to lose needs two to four months; faster loss costs muscle, not fat, and is harder to keep off.
How much should I feed a dog to lose weight?
Calories for the ideal weight, not the current one: the resting energy of the target weight times the WSAVA weight-loss factor (1.0). The dog food calculator’s weight-loss mode does that sum when you enter the ideal weight from this page.