Measure length and leg first
A Cornish Rex fits a small-to-medium carrier, but the proportions of this breed make measurement matter more than the label. Measure from nose to tail base for the interior length, and measure the cat sitting fully upright for roof height, because a Cornish Rex is long-legged and long-bodied for its weight, with a lean, greyhound-like build. A carrier that fits a stocky cat of the same weight can leave a Cornish Rex unable to sit without folding its ears against the mesh. The cat should sit tall, lie stretched on its side, and turn around in a smooth circle without catching its hips on the door frame.
Warmth is a sizing consideration for this coat
A Cornish Rex wears only a short, downy undercoat waved into tight ripples, with none of the guard hairs and outer layer that insulate an ordinary cat. In a carrier, that means the cat feels air movement and cold surfaces directly. Line the floor with a thick padded blanket, and in cool weather choose a carrier with solid lower walls that block drafts while the upper vents keep air circulating. A shivering Cornish Rex in a carrier is usually a cold cat rather than a frightened one, so warmth solves most of what looks like carrier anxiety in this breed. Pack a spare light blanket for longer trips so the cat can burrow, which Rex cats reliably do.
Frame shape beats floor size
A soft-sided carrier suits a light Cornish Rex for short journeys, provided its frame is rigid enough to hold its shape when carried; a collapsing roof that rests on the cat's back turns every bump into a press on the spine. For a hard-sided carrier, look for rounded interior corners and a door wide enough for the cat to walk in without ducking, since a Cornish Rex loads best when it can step in at its own height rather than be posted through a low opening. Two doors, front and top, make vet visits easier, since the cat can be lifted out from above rather than dragged out of a tunnel while it braces with those long legs.
Make the carrier furniture between trips
A Cornish Rex is a playful, people-chasing cat that investigates new objects fast, so carrier training is usually quick if the carrier lives in the room rather than the closet. Leave it open with the warm blanket inside, toss the occasional toy into it during daily play, and feed a few meals in it across the week. By the first genuine trip, the carrier should be a familiar den rather than a warning. Practice one short carry around the room and back so the motion of the handle is not new on the day the cat already has an appointment to worry about.
Distress that is not about size
A Cornish Rex that scratches frantically at the door, pants with an open mouth, or cries without pause on every trip, in a carrier that fits and is warm, may be a genuinely anxious traveller, and that is a veterinarian conversation rather than a shopping problem. Check the obvious first: a cold carrier, a sliding floor, or a cat that cannot sit upright will each produce a restless traveller who settles once the fault is fixed. Keep the carrier's measurements in the record that travels with the cat: KinsLe's Pet Passport holds your Cornish Rex's records together in one portable packet, so whoever takes the cat to the vet or on a trip picks a carrier with the right headroom and lines it warm, without needing to remember the breed's quirks.