PawsMathWhy weight matters so much for dogs
More than half of pet dogs in the US are overweight or obese, according to veterinary surveys. Extra weight is linked to arthritis, diabetes, breathing problems, some cancers and a shorter life. A landmark study of Labradors found lean dogs lived about two years longer than their heavier littermates.
How the plan is calculated
- Calorie target = RER at ideal weight = 70 × (ideal kg)0.75. This is the usual veterinary starting point for weight loss.
- Timeline assumes steady loss of 1–2% of current body weight per week, with 1.5% as the typical expectation.
- Food amount divides the calorie target by your food’s kcal per cup, leaving 10% for treats.
Tips that make weight loss work
- Measure everything with a kitchen scale, not a scoop.
- Count treats. Use low-calorie options like green beans, carrot sticks or pieces of the daily kibble. Our treat calculator sets the limit.
- Weigh every 2–4 weeks at the same time of day and adjust calories by 5–10% if loss stalls.
- Add activity gradually: longer sniffy walks, swimming for dogs with sore joints, play sessions.
- Check body condition, not just the scale. See our body condition score guide.
- Keep going after the goal. Once at ideal weight, move back to maintenance calories with the dog food calculator and keep weighing monthly.
Talk to your vet before starting a weight-loss plan, especially if your dog has a medical condition or needs to lose more than 15% of body weight.
Quick answers
How fast should a dog lose weight?
A safe rate is 1–2% of body weight per week. For a 60 lb dog that is about 0.6–1.2 lb per week. Faster loss risks muscle loss and nutritional gaps, and your dog will be hungrier and more likely to regain weight.
How many calories should an overweight dog eat?
A common starting point is the resting energy requirement (RER) calculated at the dog’s ideal weight: 70 × (ideal weight in kg)^0.75. Your vet may adjust it up or down depending on progress.
How do I know my dog’s ideal weight?
Your vet can estimate it from a body condition score. Roughly, every point above 5 on the 9-point scale means about 10–15% excess weight. A dog at BCS 7 weighing 66 lb has an ideal weight of around 50–53 lb.
Can I just feed less of my dog’s normal food?
Small reductions are fine, but cutting a regular food by more than about 20–25% can short-change protein, vitamins and minerals. For bigger cuts, a veterinary weight-loss diet is safer because it is designed to be fed in smaller amounts.
Why isn’t my dog losing weight?
The usual culprits are hidden calories (treats, table scraps, chews, another pet’s food) or inaccurate measuring. Weigh food with a kitchen scale. If your dog still isn’t losing after 4–6 weeks, ask your vet to check for hypothyroidism or other conditions.
Sources
- Kealy R.D. et al. (2002). Effects of diet restriction on life span and age-related changes in dogs, Journal of the American Veterinary Medical Association
- Pet obesity surveys and resources, Association for Pet Obesity Prevention
- Body Condition Score chart for dogs (PDF), WSAVA
A calculator can't examine your dog. If anything seems off, or you're unsure, your veterinarian is the right person to ask. Disclaimer