Cartilage and bone disorder (osteochondrodysplasia)
The same gene that folds the ears also makes cartilage elsewhere in the body grow poorly. Every cat with folded ears has it, from mild to severe. The bones of the legs and tail can thicken and the joints become stiff and painful. The cat may then limp, stop jumping or get a stiff tail. It cannot be cured, but pain relief and changes at home help. Cats with two copies of the gene become badly ill while still young; that is why nobody mates two Folds.
How it is found: A DNA test shows whether a cat has the gene, even with straight ears. X-rays and checks of the tail show how far it has got.






