Mixed-breed dogs whose parents are a Shih Tzu and a Chihuahua are commonly called ShiChis and sometimes called Chi-Tzus. ShiChis can be many different colors and are perfect for people who want the best of both dog breeds.
ShiChis are not purebred dogs and are not recognized by the American Kennel Club. Ideally, these tiny dogs are 50 percent purebred Chihuahua and 50 percent purebred Shih Tzu, but breeders often breed multigeneration crosses.
ShiChis can favor one parent or the other or look completely unlike either breed. Some have unusually long legs, while others take on the behavior of one breed but have the look of the other. Breeding the Shih Tzu and the Chihuahua may help alleviate some of the more abrasive traits in the Chihuahua, such as barking, because the Shih Tzu is generally a much more mellow breed.