There are many reasons for dog lower lip tremors. For example, when dogs are excited or nervous, their lower lips may tremble involuntarily. This usually happens when your dog meets a person, other dog, or toy that they like. Some dogs may also tremble their lower lips in order to maintain body temperature. This is a normal physiological reaction, so don’t worry too much.

In short, involuntary tremor of the dog's lower lip may be caused by a variety of reasons, both physiological and pathological. of. As pet owners, we need to closely observe changes in our dogs' behavior and take appropriate measures to ensure their health and happiness. At the same time, maintain good communication with your veterinarian to obtain professional diagnosis and treatment advice when necessary.