The Entlebucher Sennenhund or Entlebucher Mountain Dog is a medium-sized herding dog, it is the smallest of the four regional breeds that constitute the Sennenhund dog type. The name Sennenhund refers to people called Senn, herders in the Swiss Alps. Entlebuch is a region in the canton of Lucerne in Switzerland. The breed is also known in English as the Entelbuch Mountain Dog, Entelbucher Cattle Dog, and similar combinations.