Written by Muhammad Ahtisham, dog nutrition and feeding specialist. Last updated November 8, 2026.
How to use this calculator
- Enter the current and target weight in the same unit.
- Pick a pace of 1, 1.5, or 2 percent a week.
- Press the button for weeks, a checkpoint table, and daily calories.
How the dog weight loss calculator works
Veterinary teams commonly aim for about 1 to 2 percent of body weight a week. Each week the dog weighs a little less, so the loss is a fixed share of a shrinking number. The weeks to goal are the natural log of target over current weight, divided by the natural log of one minus the pace, rounded up.
Daily calories use the same method as the dog calorie calculator: RER at the target weight, times 1.0. Count every treat, chew, and topper inside it.
| Pace | 40 lb to 34 lb |
|---|---|
| Gentle, 1% a week | 17 weeks |
| Steady, 1.5% a week | 11 weeks |
| Faster, 2% a week | 9 weeks |
Worked example
- A dog weighs 40 lb and should weigh 34 lb (15.4 kg).
- RER at 15.4 kg is about 545 kcal, so the daily target is 545 kcal.
- At a steady pace the plan takes about 11 weeks, with checks every two weeks.
Keep it safe
Ask your vet to set the target weight and rule out medical causes. Read the weight loss guide and the body condition guide.
When to talk to your vet first
Dogs with kidney disease, diabetes, pancreatitis, allergies, or any other health problem need a plan from a vet. Read the terms before you change your dog's routine.