What does it mean when a dog is shaking and her tail in between legs?

A dog shaking and having its tail between its legs is a common sign of fear, anxiety, or submission. It is a way for the dog to communicate that it is feeling threatened or overwhelmed and is trying to make itself appear smaller and less threatening. This behaviour can be seen in response to a variety of situations, such as meeting new people or animals, being scolded or punished, or being exposed to unfamiliar or loud noises. It is important to understand the context in which the shaking and tail tucking is occurring in order to determine the best course of action.