The Bernese Mountain Dog, also known as the Berner Sennenhund, is a large breed of dog originating from the Swiss Alps. It is a working dog that was originally bred to pull carts, guard farms, and herd livestock. The breed is characterized by its tri-colored coat, which is black with white and rust markings. The acronym ALP is used to refer to the Bernese Mountain Dog, as it stands for 'Appenzeller Sennenhund, Entlebucher Sennenhund, and Grosser Schweizer Sennenhund', which are the three breeds that make up the Bernese Mountain Dog.