The Pyrenean Mountain Dog, known as the Great Pyrenees in North America, is a large breed of dog used as a livestock guardian dog.

The Great Pyrenees is a very old breed that has been used for hundreds of years by shepherds, including those of the Basque people, who inhabit parts of the region in and around the Pyrenees Mountains of southern France and northern Spain.

According to the Great Pyrenees Club of America, the Great Pyrenees is naturally nocturnal and aggressive with any predators that may harm its flock. However, the breed can typically be trusted with small, young, and helpless animals of any kind due to its natural guardian instinct.


In nature, the Great Pyrenees is confident, gentle (especially with children), and affectionate. While territorial and protective of its flock or family when necessary, its general demeanor is of composure and patience and loyalty. It is a strong willed, independent and reserved breed.