The origin of Shih Tzu emerges to be interwoven in the mystery of the prodigies of China and Tibet. There are several theories propounded by different anthropologists. One theory suggests that the Manchu dynasty was the origination of the modern Shih Tzu. As hypothesized by different scholars, Tibetan sleeve dogs are the ancestors of Imperial Shih Tzu. American Kennel Club (AKC) propounds the standard breed of Shih Tzu, while most common breeders use the terms 'Imperial size' or 'Teacup size'.