Chow Chows are perhaps the most well-known breed for having blue-black tongues. Their tongues are entirely dark, and this breed is easily recognizable by this unique trait.
Shar-Peis are another breed known for their distinctive blue-black tongues. They have a strong, wrinkled appearance and a tongue that matches their unique physical characteristics.
Thai Ridgebacks are a rare breed with a strong genetic predisposition to having a dark blue or black tongue. They are an ancient breed originating in Thailand.
Eurasiers are a breed known for their beautiful, fluffy coat and friendly temperament. Some Eurasiers may have blue or dark pigmentation on their tongues.