Don’t worry if the cat’s hind legs are suddenly paralyzed: the owner should first check whether the hind legs are injured or fractured. Internal injuries need to be sent to a pet shop for treatment, otherwise they will not recover on their own; if the owner feels no pain when touching the hind legs, then there is no need. Injuries can be caused by catching a cold or lack of calcium and vitamins. At this time, the owner needs to supplement calcium for the pet. The cat that receives nutrition will recover on its own.