Fold-eared cats may still get sick when they are three years old. Most cats with folded ears get sick from two months to six months old, but there are some cases where the disease starts after they are 1 year old, and some cats are 6 years old. The onset of disease begins after that, and the specific onset time is not certain depending on the breeding genes. If it is a homozygous cat with folded ears, the onset will be earlier, probably before 1 year old; if it is a heterozygous cat with folded ears, it will usually develop around 3-7 years old.

Obvious symptoms of cat disease with folded ears
1. The tail is thick, short, stiff, and unable to bend. The tail of some sick cats cannot swing;< 2. The hind limbs are too short, with unusual bends, growths or lumps;
3. The joints of the limbs are swollen;
4. The hind feet are abnormally thick. If you observe carefully, when the cat sits upright, , the occipital flesh of the rear foot cannot touch the ground;
5. Abnormal growth of nails.