The word "tired dog" is not a standard Chinese word or the name of a biological species. It may be an image description of certain situations, such as "tired into a dog", which is a popular Internet term used to describe A very tired state.

As for "rat dog", this word is not a standard biological classification name. In Chinese, "rat" refers to a mouse or similar small mammal, while "dog" is another domestic animal. If "rat dog" refers to a specific animal or situation, then it may be a colloquial name in a particular region or culture, and its pronunciation and meaning may vary from region to region.