Scales don’t tell the whole story — but comparing your pet’s weight with the typical healthy range for their size is a useful first check. Choose your pet, enter their weight, and see instantly where they stand. The result updates live as you type.
How the check works: the formula
The checker compares your pet’s weight with the typical healthy range for their species and size, then classifies the result:
| Pet | Typical healthy range |
|---|---|
| Cat (average domestic shorthair) | 8–12 lb |
| Small dog (adult under 20 lb) | 5–20 lb |
| Medium dog (adult 21–50 lb) | 21–55 lb |
| Large dog (adult over 50 lb) | 56–100 lb |
- Underweight: below the range
- Healthy weight: inside the range
- Overweight: up to 20% above the top of the range
- Obese: more than 20% above the top of the range
Because weight alone can mislead — muscle weighs more than fat — back it up with a hands-on check:
- Ribs: you should feel them easily with light pressure, under a slight fat covering.
- Waist: look from above — there should be a visible tuck behind the ribs.
- Tummy: look from the side — the belly should tuck up rather than hang level.
Assumptions
- Ranges are typical for average mixed-breed pets; individual breeds vary (a lean sighthound and a stocky bulldog can both be healthy at very different weights).
- The 20% threshold follows the widely used veterinary convention that obesity begins around 20–30% above ideal weight.
- Puppies, kittens, pregnant or nursing pets are still growing or have special needs — this checker is for adults.
Sources
- World Small Animal Veterinary Association (WSAVA) — Global Nutrition Guidelines
- American Animal Hospital Association (AAHA) — Nutritional Assessment Guidelines for Dogs and Cats
- Cornell University College of Veterinary Medicine — body condition scoring guidance
Frequently asked questions
My pet is above the range but looks fine. Should I worry?
Possibly not — muscular or large-framed pets can exceed the range while staying lean. Do the hands-on rib and waist check, and ask your vet for a body condition score to be sure.
Are some breeds exceptions?
Yes. Sighthounds like greyhounds are naturally lean, while breeds like bulldogs and pugs carry more bulk. The ranges here are averages — your vet can set an ideal weight for your pet’s breed and frame.
How quickly should an overweight pet lose weight?
Guidelines generally aim for about 1–2% of body weight per week in dogs and 0.5–1% per week in cats, under veterinary supervision. Faster loss — especially in cats — can be dangerous.
Can I use this for my puppy or kitten?
Not reliably — youngsters are growing, so weight-for-age charts from your vet or breeder are more useful than adult ranges.
What if my pet is underweight?
First rule out underfeeding and parasites with your vet, especially if the weight loss was sudden. Some pets are simply lean, but unexplained loss of more than 10% of body weight always deserves a check-up.
This tool gives estimates for guidance only and is not veterinary advice. Your vet can assess body condition far more precisely with a hands-on exam.
Keep reading: browse our Guides hub for more step-by-step help with your pet’s health.