One glance is usually enough to spot it. When a dog opens its mouth and reveals a deep blue-black tongue, most people immediately think of one breed in particular. While a few dogs may show darker ...

**Chow Chow and Shar-Pei's Tongue Color**: Both the chow chow and the shar-pei are required by their breed standards to have solid blue-black tongues. This distinctive trait is inherited and can ...