Devon Rex congenital myopathy: screening, treatment and budget
The Devon Rex is an endearing breed, but an inherited neuromuscular disease has long been described in it. A study by Richard Malik and colleagues, published in 1993 in the Journal of Small Animal Practice, followed six closely related Devon Rex cats with a congenital muscle disease over three years: passive ventroflexion of the head and neck, dorsal protrusion of the shoulder blades, megaoesophagus, generalised weakness and fatigability, with signs appearing between three and twenty-three weeks of age (study on Google Scholar). Four of those six cats died suddenly after the pharynx or larynx became obstructed with food, which says the essential about the risk. Our Devon Rex breed page puts this fragility back into the wider profile.
Signs that also affect swallowing
The typical picture combines fluctuating muscle weakness, stiffness or spasticity on exertion, a head held low and rapid tiring during play. The critical point is swallowing: megaoesophagus and weakness of the pharyngeal muscles expose the cat to food going down the wrong way, aspiration pneumonia and choking. A kitten that regurgitates after meals, coughs while eating or freezes after a few minutes of play should be seen promptly. Only a vet can make the diagnosis, combining a neurological examination, imaging of the oesophagus and, if needed, a muscle biopsy.
A clarified genetic origin: the COLQ gene
In humans, congenital myasthenic syndromes are often linked to the CHRNE gene, which encodes a subunit of the acetylcholine receptor. In the Devon Rex, veterinary literature points to a different gene: a study by Barbara Gandolfi and colleagues, published in 2015 in Animal Genetics, identified a missense variant of the COLQ gene, causing an endplate acetylcholinesterase deficiency, in affected Devon Rex and Sphynx cats (study on Google Scholar). Inheritance is recessive and the allele frequency measured in the Devon Rex population was low, in the order of a few per cent. A DNA test on a cheek swab is offered by specialist laboratories, including the Veterinary Genetics Laboratory at the University of California, Davis, and it allows breeders to avoid pairing two carriers.
A second weak point and everyday care
Medial patellar luxation is the other thing to watch in this light, supple breed. A study by Gary Smith and colleagues, published in 1999 in the Journal of the American Veterinary Medical Association, assessed 78 cats and found patellar luxation in 58 % of them, grade 1 in the large majority of cases, with a weak but real association with hip dysplasia (study on Google Scholar). Many mild forms stay silent: a skipping gait or a refusal to jump justifies an orthopaedic examination. The Devon Rex is also prone to seborrhoeic skin disease, a topic covered separately; the grooming basics are in our cat care and grooming section.
Care budget and insurance
The DNA test costs a few tens of euros and is done only once. The rest depends on severity: specialist consultations, radiographs, treatment of aspiration pneumonia that may require several days of hospitalisation, lasting dietary adaptation, and patellar surgery for higher grades, whose cost runs into the hundreds. These expenses are irregular but heavy. Insurance almost never covers a condition that has already been declared: cover must be taken out before signs appear, and the policy should be read closely on the sensitive points, waiting periods and hereditary conditions. Compare offers on our Devon Rex insurance page and take time over our guide to cat health insurance.
Frequently asked questions
Are all Devon Rex cats affected?
No. The disease is recessive: only cats carrying two copies of the COLQ variant develop signs, and the allele frequency measured in 2015 remained low within the breed.
Is the test the same as for the Sphynx?
Yes, the same COLQ variant was identified in both breeds by the 2015 study, and laboratories offer a single Devon Rex and Sphynx test.
What should I do if my cat chokes while eating?
That is a veterinary emergency. Outside such episodes, adapting food texture and bowl height is decided with the vet, never on your own.
This guide is part of Planète Pets’s Cats universe. Our advice is general in nature: for any health concern, your veterinarian remains the only reference.