Dogs with black tongues are not necessarily fierce. A dog's personality and behavior are influenced by many factors, including genetics, environment, socialization, and training. Tongue color is only an external characteristic of a dog and cannot be used as the only criterion for judging its vicious character.

The native dog is a unique dog breed in China with a long history and wide range of uses. They are often used for home care, hunting, and sheep herding, so they may be alert and aggressive. However, this does not mean that all native dogs are ferocious. Each dog has its own unique personality and behavioral characteristics.