A sign warning walkers about the presence of Great Pyrenees dogs with cattle is pictured near Les Diablerets July 31, 2012. Swiss farmers use Great Pyrenees dogs to protect their cattle from wolves. 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. Picture taken July 31, 2012. REUTERS/Denis Balibouse (SWITZERLAND – Tags: AGRICULTURE ANIMALS SOCIETY)

Federico Lavanche