From the American Kennel Club
The Bernese Mountain Dog is aristocratic in appearance, and ancient in lineage. The breed has long been at home on the farms in the midland of Switzerland. One of the four varieties of Swiss Mountain Dogs, the Bernese known in its native land as the Berner Sennenhund, shares similar distinctive coloring with other varieties, but is the only one with a long, silky coat. The other three are the Appenzeller Sennenhund, the Entlebucher Sennenhund, and the Greater Swiss Mountain Dog.