Appenzeller Sennenhund also knows as Appenzeller Mountain Dog is a medium-sized breed of dog that belongs to Swiss mountain dogs The Appenzeller Sennenhund is a medium-sized dog weighing around 22 to 32 kg. and height around 18.5 to 23 inches, they have a heavy build, they have a thick, shiny topcoat in black or brown with tan and white markings, covering a thick black, brown, or grey undercoat.