The reason why cats with folded ears are limping when they walk is because they are sick. Cats with folded ears are born with a "genetic defect" and will suffer from rickets. There is no specific time for the onset of rickets. Even cats with folded ears who are not affected will have problems such as enlarged joints and deformed palms throughout their lives. Folded-ear cats affected by the disease will have difficulty moving due to body pain, so the cat will limp when walking. Chondrosis is a genetic disease and cannot be cured. If a cat with folded ears is sick, he should go to the hospital to take an X-ray and then give the cat chondroitin according to the doctor’s judgment. Chondroitin is a drug that relieves the pain caused by bone growth in cats and can be taken long-term after the disease occurs.