The reasons that can cause French Bulldogs to tremble and tremble are as follows: 1. When dogs are stimulated by the outside world or frightened by strangers, their bodies will tremble and tremble unconsciously; 2. When the weather changes and becomes colder or hotter, it will also cause The dog is trembling all over; 3. Caused by disease. At this time, the dog's condition is not very good, and may be accompanied by vomiting, diarrhea, etc.