The Pyrenean Mountain Dog is a breed of livestock guardian dog from France, where it is known as the Chien de Montagne des Pyrénées or more commonly the Patou. It is called the Great Pyrenees in the United States. The breed comes from the French side of the Pyrenees Mountains that separate France and Spain. It is recognised as a separate breed from the closely related Pyrenean Mastiff which is from the Spanish side of the mountains. The breed is widely used throughout France as a livestock guardian, particularly in the French Alps and Pyrenees, protecting flocks from predation by wolves and bears. The breed is also used in the United States to protect flocks from various predators.