Heavy-boned by design, not by default
The Selkirk Rex descends in part from sturdy, broad British stock, and it shows: a solid, muscular body, substantial bone, a round head, and a coat of loose curls that stands away from the body in a tousled halo. Lift a lean Selkirk and you will be surprised by the weight in your arms; that heft is frame and muscle, and it is correct. The mistake is letting correct heft excuse incorrect padding. This breed can absolutely become overweight, and when it does, the fat settles over an already generous build and under an already voluminous coat, doubling the camouflage. Your verdict has to come from landmarks, not from how impressive the cat feels to hold.
Checking through the curls
Curls defeat casual stroking, so check deliberately. Use your fingertips to work down through the coat along the rib cage until you are in contact with the body wall, then slide backward and assess the cover. A Selkirk in condition gives you ribs that are clearly present under a modest layer, a spine you can follow, and hip points that feel like smooth, covered knobs. A heavier cat gives you a continuous padded surface, a back that feels level and broad with no waist step behind the ribs, and a handful of softness low on the belly that stays filled when you lift it gently. Whiskers on this breed are curly and brittle, the coat needs space to be itself, but the body underneath still answers the same questions as any other cat's.
Use grooming days as measurement days
Selkirk owners handle the coat more than most, and those sessions are built-in assessment chances. After a bath, before the curls dry back into full volume, the real outline is briefly visible: look for the inward curve behind the ribs from above and the upward tuck of the belly from the side, and take the monthly weight while the moment is organised. Compare weights taken in the same dry, post-groom state, because a soaked or freshly fluffed coat changes appearance wildly while changing the true number hardly at all. What you are building is a consistent series, same method each time, so that a genuine upward drift cannot hide inside the breed's theatrical fur.
Where a stocky cat's surplus comes from
Selkirks are easygoing, patient cats, often content to be where their people are, and their solid appetites match their solid frames. The risk pattern is portioning by eye for a big-looking cat, then discovering that the big look was mostly bone and curl while the calories were sized for a genuinely larger animal. Measure a week's food precisely, including the extras that accumulate around a sociable cat's day, and compare the total against what your vet advises for the cat's target condition rather than its current appearance. If several people feed, agree the daily measured amount in writing; this breed's calm persistence at the bowl wears down informal arrangements.
When to ask the vet about a Selkirk
Arrange a body-condition check if ribs cannot be traced without pressing firmly, if the waist step has vanished under your hands, or if consistently measured weights keep rising after the frame has matured. Contact the vet promptly if gain comes with new breathlessness on mild exertion, a marked drop in play, trouble jumping onto furniture that was routine, or coat and skin changes such as greasiness or matting that grooming no longer controls, because a heavy cat who is also slowing down deserves a proper examination before food is cut. Take your weight series to the appointment. Sharing those checks and feeding amounts with the household through KinsLe's Family Sharing keeps your Selkirk Rex's care based on one agreed picture of condition.