The black tongue taxi dog may refer to the Chow Chow, which is a very ancient dog breed. One of its characteristics is that it has a blue black tongue. . The Chow Chow is large in size and has a gentle personality. It can be used as a hunting dog, tow dog, guard dog or companion dog.

It should be noted that the word "taxi dog" It may have different meanings in different regions, and in some places it may refer to local native dog breeds. If you are referring to a specific local breed by "Shitzu", then more information may be needed to determine the specific species. If you want to know more about your dog, it is recommended to contact your local veterinarian or professional dog breed identification agency.