The reasons that may cause this situation are as follows: 1. The body lacks calcium, vitamins and other nutrients, which will cause the French Dou to be lame for a short period of time. The owner can only supplement it for a period of time; 2. Keep pressing yourself while sleeping. If the leg has no blood circulation, it will get better after waking up for a while; 3. The leg is injured. At this time, the owner should carefully check whether there is any obvious trauma, and if it is serious, send it to a doctor for treatment.