Chow Dogs Are The Only Breed To Have Black Tongues

Did you know that “Chows” are the only dogs with  black tongues?

The blue-black/purple tongue gene appears to be dominant, as almost all mixed breed dogs that come from a chow retain the tongue color. This is not to say, however, that every mixed breed dog with spots of purple on the tongue is descended from chows, as purple spots on the tongue can be found on a multitude of pure breed dogs.