The Appenzeller Sennenhund is a Swiss breed of medium-sized working dog. It originates in the Appenzell region of north-eastern Switzerland, and is one of four regional breeds of Sennenhund or Swiss mountain dog, all of which are characterised by a distinctive tricolour coat.
Image credit: Appenzeller Blaess, CC BY-SA 3.0
Adapted from Wikipedia, CC BY-SA 4.0 — https://en.wikipedia.org/wiki/Appenzeller_Sennenhund