The Shar-Pei is a type of dog breed known for its deep wrinkles and blue-black tongue. Although the Shar-Pei has been identified as a basal breed that predates the emergence of the modern breeds in the 19th century, the American Kennel Club recognized it as their 134th breed only in 1992. color, and any Shar-Pei with a 'flower-coat' (white with either black or blue patches) is a disqualification. Colors include black, blue, brown, red, fawn, red-fawn, five-point red, cream, apricot, chocolate, and various sables (e.g. sables, black silver sables and black bronze sables). In the Shar-Pei, they discovered four small differences located in the gene HAS2, which is responsible for making hyaluronic acid synthase 2. That enzyme makes hyaluronic acid, which is one of the key components of the skin.
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