Scottish Fold: Breed Quirks

The mutation that folds the ears is the same one that affects cartilage, so the disease is not a separate risk that some cats escape. Current findings suggest all Scottish Fold cats are affected by osteochondrodysplasia to some extent, and any cat carrying at least one copy of the ear-folding variant can develop it. Severity and age of onset vary a great deal, which is why some Folds look fine for years. A large Australian study of primary-care records found a clinical diagnosis recorded in only 1.1 percent of 1,131 Folds, but diagnosis requires radiographs that most pet cats never get, and that same study found more extensive skeletal changes in Folds than in straight-eared Scottish Shorthairs on blinded radiographic review.

It reduces severity rather than eliminating disease. Responsible breeders do breed fold-eared cats only to straight-eared cats to minimize arthritic and bone conditions, but the disease is dominant, so a single copy is enough, and recent evidence indicates any cat carrying at least one copy can develop osteochondrodysplasia. Cats Protection goes further, noting that even cats bred from Scottish Folds that do not have folded ears are still at risk of earlier onset and faster progressing arthritis. The British Veterinary Association's position is that breeding the Scottish Fold should be condemned outright.

FIFe will not register cats suffering from osteochondrodysplasia, which it defines as an autosomal dominant gene causing progressive joint, bone and cartilage deformity, naming the Scottish Fold as its example, and it extends that exclusion to any cat with such a cat in its ancestry: those cats cannot be bred, registered, shown, promoted or advertised. It went further than a policy statement. The breed's registration codes were deleted with effect from 1 January 2012 and the rules say they cannot be re-created, and a separate clause blocks the obvious workaround by refusing to register any progeny of an affected cat as a British Shorthair or Longhair regardless of ear type. Cats Protection states that the Governing Council of the Cat Fancy does not recognize the breed for pedigree registration in the UK due to welfare concerns. The CFA does recognize it, and has since 1978, though its own breed guidance says a well-bred Fold will have a flexible tail and no problems with its gait, and its standard disqualifies a tail lacking flexibility due to abnormally thick vertebrae. Two registries are reading the same mutation and reaching opposite conclusions: one treats the folded ear as the disease marker, the other treats a stiff tail as the disqualifying sign. Legally, since 1 January 2026 it has been prohibited to keep a folded-ear cat in the Netherlands. The decree is unusually specific: it names the TRPV4 variant behind the fold and then presumes any cat with forward-drooping ears to carry it, which is what makes the rule enforceable on sight rather than by DNA test. Keeping is the only prohibited act, since breeding was already unlawful there from 2014 and a trade ban was dropped as redundant. A cat already being kept before the cutoff may be kept for life and may still change hands, on written proof of when its microchip was placed or registered, but may not be shown. In Scotland, licensed breeders are separately caught by a 2021 licensing condition that bars keeping a cat for breeding where its genotype, conformation, behavior or state of health means breeding from it could harm the offspring, which is the only UK instrument that names conformation outright and the only one that reaches cats at all.

Watch for behavior changes rather than obvious limping, because cats hide pain and this breed's placid temperament masks it further. The signs to log are sleeping more than usual, hesitation before jumping, poor grooming, reduced playfulness, changes in litter box use and new aggression, and a normally cuddly Fold that suddenly avoids being held or petted may be showing pain. Clinically the disorder shows up as lameness and a stiff, inflexible tail, with narrowed joint spaces and irregularly shaped bones of the lower limbs on radiographs. There is no treatment for the underlying condition, but your vet can build a pain management plan and advise on home changes.

No, and this is a useful thing to know before you buy. A thickened, inflexible tail and a stiff gait are clinical signs of osteochondrodysplasia, not breed type. The CFA standard itself states that a well-bred Fold will have a flexible tail and no problems with its gait, so a stiff tail in a kitten is a reason to walk away rather than a charming quirk.

Polycystic kidney disease and hypertrophic cardiomyopathy. PKD is an inherited progressive disease in which fluid-filled cysts gradually replace working kidney tissue, and 6.90 percent of Scottish Folds in a general Japanese hospital population carried the conventional PKD1 variant. There is a DNA test, so ask for parental results or have your own cat tested. HCM, a thickening of the heart's main pumping chamber wall, affects as many as one in seven cats overall and is usually silent, so it needs an echocardiogram rather than a stethoscope alone.