Devon Rex cats are prone to a set of named conditions that rewards early noticing rather than worry: hypertrophic cardiomyopathy, hereditary myopathy, patellar luxation, hip dysplasia, oily skin with seborrhoea, and heavy ear wax build-up. None of these is a verdict on an individual cat. Each one is a reason for a particular check, a watch sign at home, and a conversation with your vet about screening suited to age and lineage.
Heart and Muscle: Hypertrophic Cardiomyopathy and Hereditary Myopathy
Hypertrophic cardiomyopathy is a thickening of the heart muscle that a vet screens for by listening for a murmur or an uneven rhythm and, where indicated, arranging heart imaging through your clinic or a referral service. At home, the signs worth reporting are faster or laboured breathing at rest, tiring sooner during play, eating less, or a faint or collapse, and any of those deserves a prompt call rather than a wait-and-see approach.
Hereditary myopathy is a muscle weakness condition recorded in the breed. Its early picture can include a drooping head position, a wobbly or high-stepping way of moving, difficulty swallowing, or food seeming hard to manage. Because swallowing difficulty carries its own risks, a cat who coughs over meals, drops food, or holds the head low while walking should be examined without delay, and a short home video of the movement can help your vet judge what you are seeing.
Kneecaps, Hips and Everyday Movement
Patellar luxation means a kneecap slips out of its groove. An owner may notice a brief skip in a hind leg, a leg carried for a few steps and then used normally again, reluctance to jump up, or stiffness after rest. Your vet screens for it by feeling each kneecap during an examination and grading how freely it moves, and will explain whether monitoring, weight control, or further assessment is appropriate for your cat.
Hip dysplasia is reported in the breed and involves a hip joint that does not sit snugly in its socket. Signs can be subtle in cats: less jumping to favourite high places, slower stair use, a bunny-hopping motion with both hind legs together, grooming less around the hindquarters, or irritability when picked up. Imaging is the vet's route to confirming what hands-on examination suggests, so report the change in movement rather than trying to test the joint yourself at home.
Skin Oil, Seborrhoea and Ear Wax
The Devon Rex coat does not absorb skin oil the way a fuller coat does, so oil collects on the skin instead. That breed trait explains oily skin with seborrhoea: greasy-feeling patches, flaking, a yeasty smell, dark debris in skin folds, and scratching or over-grooming of itchy areas. Your vet can distinguish ordinary breed oiliness from irritation that needs attention, and can advise how often gentle wiping or bathing suits your cat, since over-bathing can leave sparsely coated skin dry and sore.
Heavy ear wax build-up belongs to the same picture. Ears may hold dark wax deep in folds that a fuller-eared cat would shed more easily. Watch for head shaking, ear scratching, a sour smell, or wax that returns quickly after gentle cleaning, and never push anything deep into the ear canal. At routine visits your vet can look down the ear, judge whether wax is simple build-up or a sign of irritation, and show you a safe cleaning depth for home care.
Screening Questions Worth Asking
Ask a breeder what heart screening the parents have had, whether hereditary myopathy has appeared in the line, and how kneecaps and hips have been assessed. Ask your vet which of these checks belong at kitten visits, which belong in adult years, and what change should bring your cat in sooner. Keep dates and findings in order, because a murmur heard once, a kneecap grade, and a skin pattern across seasons only become useful information when they can be compared visit by visit. For appointments away from your usual clinic, KinsLe makes that history portable inside its Pet Passport, so a new vet can read prior screening without starting again.