The Thai Ridgeback (Thai: ไทยหลังอาน, RTGS: Thai Lang-An) is a dog recently established as a standardized breed. The breed was formerly unknown outside Thailand, but is gaining notice in the Western world. They are also known as a Mah Thai Lang Ahn. The Thai Ridgeback is one of only three breeds that has a ridge of hair that runs along its back in the opposite direction to the rest of the coat. The other two are the Rhodesian Ridgeback and the Phu Quoc Ridgeback.