Is My Cat Overweight?

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Cats are masters of disguise: a thick coat can hide several pounds of extra weight, and most owners stroke their cat daily without realising it has gradually grown rounder. Surveys by the Association for Pet Obesity Prevention suggest that close to 6 in 10 pet cats are overweight or obese. This guide shows you the same body condition check vets use — plus the one cat-specific trap to avoid.

Short Answer: Feel your cat’s ribs — they should be easy to find under a light fat covering — and look for a waist behind the ribs from above and the side. Vets score this on a 9-point scale, with 4–5 being ideal. Do not confuse the primordial pouch (a normal flap of belly skin) with fat. If the ribs are hard to feel or there is no waist, see your vet for a target weight and a supervised slimming plan.

Last reviewed: 3 November 2026 · The Paw Pilot editorial team

Why extra weight is risky for cats

Obese cats face sharply higher risks of diabetes mellitus, arthritis, urinary tract disease, skin problems and difficulty grooming. Overweight cats also handle anaesthesia and surgery worse, and — critically — cats that stop eating or lose weight too fast can develop hepatic lipidosis (fatty liver disease), which can be fatal. That is why weight loss in cats must always be slow and vet-supervised.

The 9-point body condition scale

The WSAVA Global Nutrition Guidelines standardise a 9-point body condition score (BCS) for cats. Scores 4–5 are ideal.

Score	Category	What you see and feel
1	Emaciated	Ribs, spine and hip bones prominent; no fat; severe muscle loss
2	Very thin	Bones easily seen and felt; minimal fat cover
3	Thin	Ribs easily felt, slightly visible; obvious waist
4–5	Ideal	Ribs felt with slight fat cover; waist visible from above and side; minimal belly fat
6	Above ideal	Ribs felt with slight excess fat; waist just visible
7	Heavy	Ribs hard to feel; rounding of belly; fat on lower back
8	Obese	Ribs cannot be felt; no waist; obvious belly rounding and fat pads
9	Severely obese	Heavy fat over neck, legs and belly; no waist; may struggle to groom or jump

Try the Pet Body Condition Checker

Answer a few questions about your cat’s shape to estimate its body condition score.

Open the Checker

The at-home check

1. Feel the ribs. With flat fingers, stroke along both sides of the ribcage. You should feel each rib easily under a thin fat layer — like feeling your knuckles through a thin cloth.

2. Look from above. There should be a gentle inward curve (waist) between the ribs and hips.

3. Look from the side. The belly should tuck up slightly behind the ribs rather than sagging straight or bulging down.

The primordial pouch trap

Many cats have a loose flap of skin and a little fat along the lower belly — the primordial pouch. It is normal anatomy (it protects organs during fights and lets the body stretch when running), and even lean cats can have a noticeable one. Judge condition by the ribs, waist and overall shape — not by the pouch alone.

Weighing your cat

Monthly weigh-ins on the same scales catch drift early. A digital baby or kitchen scale works well: weigh the carrier with and without the cat, or weigh yourself holding the cat and subtract. Keep a dated log. Most vet clinics also offer free weigh-ins.

Safe weight loss for cats

See your vet first. Rule out medical causes (such as fluid retention or hormonal disease) and agree a target weight.

Go slowly. The accepted safe rate for cats is about 0.5–2% of body weight per week — slower than for dogs. Crash dieting can trigger hepatic lipidosis.

Measure meals. Work out portions from the target weight (see How Much Should I Feed My Cat?), split into 2–3 meals, and stop free-feeding dry food.

Add activity. Short daily play sessions with wand toys, plus puzzle feeders instead of a bowl, burn calories and fight boredom.

Watch appetite closely. A cat that stops eating for more than 24–48 hours needs veterinary attention promptly — especially an overweight cat.

Frequently asked questions

Is the belly flap fat or normal?
The primordial pouch is a loose skin flap along the lower belly and is normal, even in lean cats. True obesity shows as an overall round shape, ribs you cannot feel, and no waist.

Why are indoor cats more prone to weight gain?
Less activity, constant food access and neutering all lower calorie needs. Indoor cats need measured meals and daily play — see How Much Should I Feed My Cat?.

Can I put my cat on a diet myself?
Not without veterinary guidance. Cats need a carefully managed plan: too little food, too fast, risks fatty liver disease. Your vet will set the calorie level and monitor progress.

How fast should my cat lose weight?
About 0.5–2% of body weight per week. Re-weigh monthly and adjust only on your vet’s advice.

What is the best food for an overweight cat?
Often a high-protein, lower-calorie formula fed in measured meals, sometimes with more wet food for fullness and hydration. Your vet can recommend a specific diet — prescription weight-loss foods exist for cats that struggle.

Related guides

Disclaimer: This guide is for general information only and is not a substitute for veterinary advice. Overweight cats must lose weight only under veterinary supervision — rapid weight loss can cause life-threatening fatty liver disease. Talk to your veterinarian about a tailored plan.