You know a Cornish Rex is being fed too much when its naturally lean, tucked-up outline starts to fill in: the waist vanishes from above, the belly loses its upward tuck from the side, and the ribs that should be easy to feel under that short wavy coat start hiding under a layer of softness. The Cornish Rex is built like a small greyhound, all legs, curves, and visible athleticism, and it carries a famously persuasive appetite — so the breed's shape, not its behaviour at the bowl, has to be your measuring tool.
Why a Cornish Rex fools owners at mealtimes
A Cornish Rex burns energy enthusiastically. This is an acrobatic, warm-bodied, always-involved cat that races, climbs, and solicits games, and many individuals act hungry as a hobby, shadowing whoever enters the kitchen and performing outrage at an empty dish. That performance is poor evidence of need. If you top up the bowl every time the act plays, portions creep quietly, and because the breed starts out so slender, even a modest surplus changes the outline within a few weeks — which is exactly why scheduled checks beat daily impressions.
The hands-on checks that work for this breed
Stand over your standing Cornish Rex and look down: you should see a clear narrowing behind the ribs before the hips. From the side, the belly line should sweep upward toward the hind legs rather than sagging level or low. Run flat palms along the ribcage with light pressure; on a correctly fed Rex the ribs are plainly feelable with almost no fat cover, and the spine and hip points stay defined though never sharp. Weigh monthly on the same scales and write the number down. A steady climb past the cat's known lean adult weight, together with a fading waist, is overfeeding confirmed — no single glance settles it.
Auditing what actually reaches the bowl
Before cutting food, count everything your Cornish Rex truly eats for three days. That means the measured meals, the treats used in play, any food stolen from another pet's dish, and the extra handful a family member adds because the cat seemed sad. Rex cats are athletic enough to reach counters and open light cupboards, so include raids in the audit. Then measure meals with a kitchen scale or a marked cup rather than pouring by eye, and split the day's food into set meals instead of leaving a topped-up bowl, since this breed grazes all day.
Adjusting portions without a battle
If the checks say your Cornish Rex is overfed, reduce the daily amount in small steps rather than slashing it, and swap some treat calories for play sessions — this breed will usually chase a wand toy with the same enthusiasm it aimed at the biscuit tin. Keep protein quality high and let the waist, checked weekly with your hands, judge the new amount over a month. Feed separately from other pets if bowl-stealing is part of the picture, and put the cat's athleticism to work with climbing and hunting games before the evening meal.
When the shape change needs a vet
Book a veterinary visit if your Cornish Rex is gaining despite honestly measured portions, because a slowing metabolism or another health issue can sit behind unexplained gain in a normally racy breed. Go sooner if weight rises alongside new lethargy, heavy drinking, a dull or thinning coat, or a swollen-looking abdomen rather than an even, all-over softening. Bring your written weights and the food audit; they turn a vague worry into a conversation the vet can act on. To keep the household honest day to day, KinsLe's Care Teams let each feeder mark your Rex's meals complete with a timestamp, so nobody serves a second helping to a cat who has already eaten.