Sennenhunds, called Swiss mountain dogs or Swiss cattle dogs in English, are a type of dog originating in the Swiss Alps. The Sennenhund are farm dogs of the general livestock guardian type. There are four breeds of Sennenhunds, all sporting a unique tricolor coat. While the two larger ones share a heavy build and a calm temperament, the two smaller ones are more agile. The breeds range from medium in size to very large. The name Sennenhund refers to people called Senn or Senner, Swiss Alpine herdsmen and dairymen, and does not translate as "mountain" or "cattle".

Albert Heim was a Swiss geologist, noted for his three-volume Geologie der Schweiz.