If a normal cat lifts one front foot, it does not mean that it is sick. This is a tentative movement of the cat. However, if the cat has folded ears, it may be due to rickets, and you need to go to the hospital to take a x-ray to check. Pay attention to supplementing calcium substances to cats to avoid pain and discomfort. Normally, it is not recommended to raise folded-eared cats, because folded-eared cats will be more painful in old age, so it is not recommended to breed folded-eared cats.