How to Tell if Your Cat Is Overweight (and What to Do)

Cats carry weight in sneaky ways. Fur hides the shape, a loose belly flap can look like fat when it isn’t, and a round cat often looks cute, so extra pounds can go unnoticed for years. Because cats are small, even a pound or two is a big proportion of body weight.

Extra weight isn’t harmless, though. It raises the risk of diabetes, joint pain and other problems. The good news is that you can check at home in a couple of minutes, and most cats can slim down safely with a vet’s help. If you have a dog too, see our version for dogs: how to tell if your dog is overweight.

The short answer

Don’t rely on the scale alone, since healthy weights vary with frame and breed. Use three hands-on checks: ribs, waist and belly. If you can’t easily feel the ribs, there’s no waist from above, and the belly sags, your cat is probably carrying extra weight. Ask your vet to confirm it and to set a target weight and a safe plan.

How to check your cat at home

Check with your cat standing, in good light, and use your hands, since fur can hide the shape.

1. The rib check.
Run your hands along your cat’s sides. You should be able to feel the ribs under a thin layer of fat, a bit like feeling the back of your hand. If you have to press firmly to find them, your cat may be overweight. If the ribs feel sharp and prominent, your cat may be underweight.

2. The waist check (from above).
Look down at your cat. You should see a slight narrowing behind the ribs. A body that looks like a straight tube or bulges outward suggests extra weight.

3. The belly check (from the side).
The belly should tuck up slightly behind the ribs. A belly that hangs low and swings when your cat walks suggests extra fat.

A note on the “primordial pouch.” Many cats have a loose flap of skin and a little fat under the belly, near the back legs. It’s normal, and it’s there even on lean cats. A pouch that is small, loose and moves freely is usually fine. A heavy, firm belly that sags along its whole length is more likely extra weight. If you’re unsure, ask your vet.

Other signs: fat over the back and base of the tail, a rounded face, tiring quickly, reluctance to jump, trouble grooming the back end, or matted fur at the rear.

Body condition score

Vets usually use a body condition score (BCS), often on a 9-point scale, where about 4 to 5 out of 9 is ideal. Here’s a simplified version:

Score	What you’ll see and feel
1-3 (underweight)	Ribs, spine and hip bones easily visible, little to no fat cover
4-5 (ideal)	Ribs easily felt, clear waist, belly tucks up slightly
6-7 (overweight)	Ribs hard to feel, waist barely visible, noticeable belly fat
8-9 (obese)	Ribs can’t be felt, no waist, belly sags, fat over back and face

Your vet can give an accurate score and say what to aim for. Several veterinary organisations also publish body condition charts you can compare against.

What about the scale?

A typical adult cat often weighs somewhere around 3.5 to 5.5 kg (8 to 12 lb), but frame matters a lot. A large Maine Coon can be healthy at weights that would be overweight for a small domestic cat. Use the scale to track trends, and the hands-on checks for the current picture. To weigh your cat at home, use a baby scale, or weigh yourself with and without your cat and subtract.

Why extra weight matters

Overweight cats are at greater risk of:

• Diabetes
• Arthritis and joint pain, which can make cats less active, and then gain more weight
• Urinary problems
• Skin problems, since cats can’t reach and groom the rear of the body
• Breathing difficulty and reduced stamina
• Higher risk with anaesthesia and surgery
• A shorter lifespan

Many owners also notice that a cat at a healthy weight is more playful, jumps better and grooms properly again.

Why cats gain weight

• Too much food, or too many treats. The most common cause.
• Free-feeding a full bowl of dry food all day
• Calorie-dense food fed by scoop, which can vary a lot. See our guide to wet vs dry cat food
• Neutering, which lowers calorie needs
• Indoor life and boredom. Indoor cats burn fewer calories, and food becomes the day’s entertainment. See our guide to food for indoor cats
• Age and low activity
• Medical causes, such as an underactive thyroid or certain medications, though these are less common than overeating

If your cat gains weight without an obvious reason, or is extremely hungry, ask your vet to check for a medical cause.

How to help your cat lose weight safely

1. See your vet first.
Have your vet confirm your cat’s weight, check for health problems, and set a target weight and a safe rate of loss.

Do not crash-diet your cat. Cats that lose weight too quickly, or stop eating, can develop a serious liver condition called hepatic lipidosis (fatty liver disease). Weight loss should be gradual and supervised.

2. Measure the food.
Weigh the day’s food on a kitchen scale instead of using scoops. Our guide on how much to feed your cat shows how to turn calories into grams, and your vet can give you a daily calorie target for weight loss.

3. Count the treats.
Keep treats and extras to around 10% of daily calories or less, and subtract them from the daily total. Check that nothing on the list is unsafe. See our guide to foods toxic to cats.

4. Look at the food itself.
Check the calories per can, cup or kg on the label. “Light” and “weight management” aren’t tightly defined, so compare real calories. Your vet may suggest a particular food or a prescription weight-loss diet. Our guide to reading a pet food label shows what to check, and you can browse our pages on dry food and fresh food.

5. Switch foods slowly.
Mix the new food in with the old over about a week, since cats can be fussy and sudden changes can upset their stomachs. Never leave a cat refusing food for more than a day or so. Contact your vet.

6. Feed in smaller, more frequent meals, or use puzzle feeders and scatter feeding. This makes the same amount of food last longer and gives your cat something to do.

7. Add play.
Short, daily play sessions with a wand toy help burn calories and cut boredom. Build up gradually, particularly for cats with joint problems.

8. Handle multi-cat homes carefully.
If you have more than one cat, one may be eating the other’s food. Feed them in separate rooms, or use feeders that open only for a particular cat, and ask your vet for advice.

9. Weigh regularly.
Weigh your cat every two to four weeks and keep a record. Your vet can adjust the plan if progress stalls or goes too fast.

Begging and “but she’s always hungry”

Many cats beg because it works. Try to:

• Stick to set mealtimes, and avoid giving in to begging
• Use part of the daily food as rewards or in puzzle feeders
• Give attention and play instead of food
• Ask your vet to rule out medical causes if the hunger is sudden or extreme, such as a cat that eats a lot and still loses weight

Mistakes to avoid

• Judging weight by looks alone. Use your hands.
• Free-feeding dry food to a cat that overeats
• Adding wet food on top of a full dry portion
• Crash dieting, or cutting food sharply
• Forgetting treats and scraps
• Assuming a round cat is just “big-boned”
• Comparing with other overweight cats
• Ignoring sudden weight changes, in either direction

When to call your vet

Contact your vet if:

• Your cat is overweight or obese by the checks above
• Your cat gained or lost weight quickly without a change in food
• Your cat is drinking or urinating much more than usual
• Your cat is lethargic, stiff or reluctant to jump
• Your cat is losing weight while eating normally
• Your cat stops eating for more than a day or so, particularly if overweight, since that can be dangerous

Final thoughts

Keeping your cat lean is one of the most valuable things you can do for their long-term health. Check their shape regularly, weigh the food, count treats, and work with your vet on a gradual plan. Progress is slow, and a few months of steady effort can make a big difference. For more on choosing a complete and balanced food, see how our reviews work.

Frequently asked questions

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