Somewhere along the GR10 in the central Pyrenees mountains, a Great Pyrenees sheepdog protecting its troop of sheep.  Know as a “Patou” in the local dialect, these are guard dogs, not herders.  That job falls to another dog, usually a border collie or other herding specialist.

Thanks to Doug McDonnal and Lisa St. George (who are actually hiking the GR10, unlike me!) for the great photo.