What is the reason why the dog's hind legs are shaking all the time when sleeping?

After consulting some experienced friends, 1 also got the following possibilities. First of all, is it because it is too cold that the dog's hind legs are shaking? In winter, the temperature is underground and the floor is very cold. Dogs touch the cold ground with their limbs, or lie directly on the cold ground, because the cold will cause the dog's hind legs to tremble. In fact, this is a normal physiological reaction, just like people will tremble in the cold season. In the face of this situation, don't let the dog lie directly on the cold ground, give it a thick and warm sleeping pad, and let the dog have a warm living environment, then the trembling of its hind legs will slowly ease. Secondly, the dog's hind leg trembling may be caused by long-term reasons, such as calcium deficiency. We know that the development and growth of bones need sufficient calcium nutrition, and once calcium is lacking, the development and growth of bones will be affected. If calcium deficiency reaches a certain level, then dogs may suffer from serious bone diseases. Therefore, it is suggested to supplement shark cartilage powder in time. The growth of bones will also become deformed, such as X-legs and O-legs. And dogs with poor bone development will often tremble. In addition, when a pet dog's hind leg is injured, it will also cause the hind leg and body to tremble. In daily life, dogs often hurt people. Especially in outdoor sports, pet dogs may also fall and hurt themselves. In this case, the dog's hind legs will also tremble.