Folded-eared cats cannot be deliberately supplemented with calcium. Cats with folded ears have varying degrees of cartilage-ossification abnormalities in their tails, ankles, knees and other parts. Deliberate calcium supplementation is not only unhelpful, but may also accelerate cartilage calcification, induce disease or aggravate the condition. However, owners do not need to reduce the calcium content in the food of folded-eared cats. They can feed cat food, canned cats and other feeds as usual. However, cats with folded ears can properly supplement chondroitin and pay attention to controlling the salt content of cat food.