A Great Pyrenees dog

A Great Pyrenees dog surveys a flock of sheep near Les Diablerets July 31, 2012. Great Pyrenees are used to prevent attacks by wolves on their cattle by Swiss farmers. In early 2012, the Swiss Federal Office for Environment counted five wolves have entered the country out of the 70 to 200 that live in France and Italy. (Denis Balibouse/Reuters)

A Great Pyrenees dog surveys a flock of sheep near Les Diablerets July 31, 2012. Great Pyrenees are used to prevent attacks by wolves on their cattle by Swiss farmers. In early 2012, the Swiss Federal Office for Environment counted five wolves have entered the country out of the 70 to 200 that live in France and Italy. (Denis Balibouse/Reuters)