Is My Cat Overweight? — ideal weight & body check 🩺

Why a cat's weight is worth thirty seconds a month

Somewhere around 60% of US pet cats are overweight or obese, which makes extra weight the most common medical condition vets see in cats — ahead of anything infectious. The consequences are unusually well documented for cats: obese cats run several times the risk of type 2-style diabetes (a disease cats get in a strikingly human way, and one that sometimes goes into remission when the weight comes off), earlier and worse arthritis — near-universal in older cats and largely invisible because cats hide lameness by simply moving less — plus urinary disease, skin problems where grooming can't reach, higher anaesthetic risk, and the fatty-liver trap discussed below.

A couple of pounds sounds trivial until you scale it: two extra pounds on a 10 lb cat is 20% of its body weight — the equivalent of an average adult putting on 30-plus pounds. The reason it goes unnoticed is the same as with dogs: our eyes calibrate to the cats we see, most of the cats we see are heavy, and a fluffy coat launders every silhouette. Hands, not eyes — which is exactly what the three questions above ask of you.

Reading the score you just got

The 9-point Body Condition Score compresses to a simple ladder: at 4–5 (ideal) you feel ribs under a thin, smooth cover, see a waist from above and a modest belly from the side. At 6–7 (overweight) ribs need real pressure to find, the waist is going, the belly rounds. At 8–9 (obese) ribs are buried, the back broadens into a slab, fat pads bulk the belly and even the face. Below 4, ribs, spine and hip bones sharpen under your hand with no cover — underweight, and in a cat that used to be heavier, a finding with its own section below.

The target weight uses the standard rule that each point above 5 represents roughly 10% excess — so a BCS-7 cat is about 20% over, and its ideal weight is the current weight divided by 1.2. One honest caveat: owners systematically score their own cats a point kind. If your hands hesitated between two answers, take the heavier one, and let your vet score the cat precisely at the next visit — it takes them seconds.

And once more for the record: the soft swinging flap low on the belly is the primordial pouch, standard equipment on lean cats too. Score the ribs and waist, not the pouch.

If your cat scored overweight: the safe way down

Start with the rule that makes cats different from every other dieter in the house: never crash-diet a cat. An overweight cat whose intake collapses — because the portion was slashed or because it refuses the new diet food — can develop hepatic lipidosis (fatty liver failure) within days, and it is life-threatening. Feline weight loss is a slow, measured campaign:

• Rate: 0.5–2% of body weight per week — ounces, not pounds. A 14 lb cat reaching 11 lb in six to nine months is a textbook success.
• Calories: feed for the target weight — our Cat Food Calculator has a weight-loss mode — and weigh the food in grams; at cat portions, a scoop's error is the diet.
• Format: wet food's water-bulk helps cats feel fed on fewer calories; if feeding dry, puzzle feeders and food balls make the cat hunt its ration, which is both slower and exercise.
• Treats: inside the 10%-of-calories cap and taken out of the ration, not added on. Half the treat, twice the ceremony — cats count events, not grams.
• Movement: two or three short play bursts a day — wand toys, thrown kibble, a laser dot ending on a real toy. Cats exercise in sprints, not walks.
• Tracking: weigh fortnightly (baby scale, or weigh yourself holding the cat and subtract). No loss over a month means trimming about 10% more calories; loss faster than 2% a week means adding some back.

If the cat refuses the reduced or changed diet outright, do not wait it out — 48 hours without eating is a vet call in any cat, and urgent in a fat one. And if genuinely nothing moves after two months of honest measuring, ask about a prescription metabolic diet and a thyroid check rather than cutting deeper.

The multi-cat complication

Most feline diets fail in the kitchen politics, not the math: the dieter finishes its measured portion and then hoovers the senior's bowl. Free-choice feeding cannot coexist with a dieting cat. The workable fixes, in rising order of technology: separate rooms at mealtimes with doors pushed to and bowls picked up after twenty minutes; feeding stations by geography — the lean cat's bowl on a counter or through a cat-flap-gated door the heavy cat can't manage; and microchip feeders that open only for the registered cat — not cheap, but cheaper than diabetes. Every human in the house has to be enrolled too; the diet's worst enemy is usually the one family member who “feels mean”.

If your cat scored underweight — especially a cat that used to be heavier

In kittens and young cats, underweight is usually parasites or underfeeding — fixable. In middle-aged and older cats, unplanned weight loss is one of the most medically significant signs a cat can show, and the classic trap is that it often comes with a great appetite: hyperthyroidism (a ravenous, restless, thinning older cat is the textbook picture), diabetes (weight loss with heavy drinking and urination), chronic kidney disease (appetite eventually fades), dental pain, and inflammatory bowel disease all live here. A senior cat losing weight on normal food is a blood-test appointment, not a bigger portion.

Old-age thinning also hides in plain sight along the spine: cats past about eleven commonly lose muscle over the back and hindquarters even when belly fat stays, which is why vets score muscle separately in seniors. If the spine and shoulder blades have sharpened under your hand compared with a year ago, say so at the next visit — it changes what the vet looks for. Safe gain, once medicine is ruled out: more calorie-dense food across three or four small meals, warmed slightly (smell drives feline appetite), with weekly weigh-ins — and an eating-well cat that still doesn't gain goes back to the vet with your log.

Keeping an ideal-weight cat ideal

If the tool said 4–5, defend it — it's far easier than reclaiming it. The whole maintenance kit: measured meals instead of the bottomless bowl; a re-portion within a month of neutering (needs drop 20–30% and the classic post-neuter gain is pure portion lag); a monthly thirty-second rib check plus a weigh-in noted somewhere; play bursts as a habit rather than a diet remedy; and scepticism about the feeding table on the bag, which is written for the average of all cats and reliably overfeeds the indoor, neutered, sofa-based specimen actually living with you. A yearly vet weigh-in closes the loop — their scale, their trained hands, your written trend.

Frequently asked questions

How do I know if my cat is overweight?

Use your hands: on an ideal-weight cat you feel ribs easily under a thin fat cover, see a waist behind the ribs from above, and a modest belly from the side. Ribs you must press to find, a lost waist and a rounding belly mean overweight. Ignore the soft swinging pouch low on the belly - that's the primordial pouch, normal even on lean cats.

What is a healthy weight for a cat?

There is no single number - frames differ too much, which is why 'average cat weight' charts mislead. The vet-standard answer is body condition: whatever weight your cat carries at BCS 4-5 (ribs feelable, waist visible) is its healthy weight, whether that's 7 lb or 14. Each BCS point above 5 represents roughly 10% of excess weight.

How can I help my cat lose weight safely?

Slowly and by measurement: 0.5-2% of body weight per week, feeding calories calculated for the target weight, food weighed in grams, treats inside a 10% cap, wet food or puzzle feeders to stretch the ration, and short daily play sprints. Never crash-diet a cat - a fat cat that stops eating risks hepatic lipidosis, a life-threatening liver condition, within days.

Why is my cat losing weight but eating normally?

In an adult or senior cat this pattern is medically significant. A ravenous but thinning older cat is the textbook picture of hyperthyroidism; weight loss with heavy drinking suggests diabetes; kidney disease, dental pain and bowel disease also start here. Book a vet visit with bloodwork rather than increasing food - these conditions are common and very treatable caught early.

Is my cat's hanging belly fat?

Not necessarily. The primordial pouch - a loose swinging flap of skin with a little fat, low on the belly - is normal feline anatomy, present even on lean, fit cats. Judge overall condition instead: if the ribs are easy to feel and the waist is visible from above, the pouch is just a pouch. If ribs are buried and the waist is gone, the cat is overweight, pouch aside.

How do I stop one cat stealing the other's food?

Separate the calories physically: feed in different rooms with bowls collected after twenty minutes, put the lean cat's station somewhere the heavy cat can't reach, or use a microchip feeder that opens only for the registered cat. Free-choice feeding cannot coexist with a dieting cat, and every human in the house has to stop 'topping up' - one soft-hearted feeder can undo the whole plan.