Causes of Chihuahua trembling:

1. Excitement. Chihuahuas are very excitable dogs, and they are also very clingy, so when you go out and come home, they will be so excited that they can't help themselves, trembling or even leaking urine.

2. Nervous. Chihuahuas are naturally timid. When they feel nervous or fearful, their bodies will instinctively tremble.

3. Low temperature. Since they are naturally more afraid of cold, as long as the ambient temperature is slightly lower, they will shiver because they feel cold, so parents must pay attention to keeping them warm.

4. Poisoning. After accidentally eating something poisonous, the body will automatically tremble, accompanied by convulsions and foaming at the mouth.

5. Epilepsy. Symptoms of epilepsy are intermittent, including trembling, convulsions, and foaming at the mouth. Once discovered, emergency medical treatment is required.