Is My Cat Overweight?

Feline obesity has reached epidemic proportions. Surveys suggest that 59–63% of pet cats in the US are overweight or obese, and cat owners are among the least likely to recognize it. Part of the reason is that weight gain in cats is subtle and gradual, and overweight cats have become so common that a heavier body has started to look normal.

Here's how to assess your cat's weight accurately at home, and why it matters more for cats than for almost any other pet.

Why Overweight Is Particularly Dangerous for Cats

Excess weight in cats contributes to diabetes (cats develop type 2 diabetes in patterns very similar to humans), osteoarthritis, urinary tract disease, and hepatic lipidosis, a potentially life-threatening liver condition.

Hepatic lipidosis (fatty liver disease) is worth understanding specifically because it affects how you manage weight loss in cats. When a cat stops eating or severely restricts food intake (even for 1–2 days), the body mobilizes fat stores to the liver faster than the liver can process them, causing dangerous fat accumulation. This means rapid weight loss diets are genuinely dangerous for cats in a way they aren't for dogs. Slow and steady is not just preferable. It's medically necessary.

The Feline Body Condition Score (BCS)

Veterinarians use the same 9-point Body Condition Score for cats as for dogs, with 4–5 representing ideal condition. The assessment is similar in principle but slightly different in practice. Cats carry weight differently than dogs, and the assessments reflect that.

How to Assess Your Cat's Body Condition

1. The Rib Check

With your cat relaxed (ideally while they're purring in your lap), place your hands gently on their sides with thumbs on the spine and fingers over the ribcage. You should be able to feel individual ribs with light pressure without pressing in. If you have to push firmly to feel them, your cat is overweight. If they're clearly visible through the coat, your cat may be too thin.

2. The Waist View From Above

Look down at your cat from directly above. You should see a slight hourglass shape: a visible but gentle inward curve at the waist, just behind the ribcage. A straight or convex silhouette (widening toward the hips with no waist definition) suggests excess weight.

3. The Side Profile

Look at your cat from the side. The belly should curve gently upward from the chest to the hind legs, a slight abdominal tuck. A belly that hangs level with or below the chest, or has a visible "pouch," indicates excess fat. Note: some cats have a loose flap of skin and fat at the lower abdomen called a "primordial pouch." This is normal anatomy in cats, not necessarily a sign of obesity. Assess the overall abdomen, not just the pouch.

4. The Neck Fold Check (Unique to Cats)

Gently pinch a small fold of skin at the back of the neck. In an ideal-weight cat, the skin moves freely with very little fat beneath it. If you can pinch a thick layer, this suggests excess fat stores even in cats that look normal from above.

BCS Reference for Cats

What to Do If Your Cat Is Overweight

Never put an overweight cat on a crash diet. As mentioned above, rapid calorie restriction can trigger hepatic lipidosis in cats, a life-threatening condition. The safe rate of weight loss is no more than 0.5–1% of body weight per week, slower than for dogs.

A moderate calorie reduction of 15–20% below maintenance, combined with increased activity (puzzle feeders, interactive play, food-dispensing toys), is the recommended approach. Weigh your cat every 2 weeks and monitor body condition. If your cat loses appetite at any point during a diet, contact your vet.

For significantly overweight cats, work with your veterinarian. Prescription weight management foods and closer monitoring may be appropriate.