The dog in the Chang'an Twelve Hours is the Chinese Thin Dog, a dog breed with a very long history in our country. Although the body is slender and the waist is extremely slender, the limbs and neck are full of muscles and are very good at running, so Regardless of whether they are in the north or the south, they are all known as "fast dogs" and "fast dogs". It is precisely because of this characteristic that in ancient times, it was often bred as a rabbit hunting dog. It can reach a speed of 70-80 kilometers per hour, which is similar to that of a rabbit. It can be said to be the fastest running dog.