The Pyrenean Mastiff is calm and loyal to their own family but their natural tendency is to guard.
They are a very large and powerful dog with a large head and a heavy, coarse, white coat with dark markings. The neck has loose folds of skin and a double dewlap. They are a Spanish mountain dog whose role was to guard sheep against attack from wolves and bears.
They are very intelligent, independent and protective. Within their own family, they are even-tempered with children, animals and people they know. Because it is in their nature to want to look after their family, they need to be socialised well with people, children and animals from outside. They do not need a lot of exercise but outings need to be frequent and regular as they will become bored if cooped up.
The fairly long coat needs regular brushing and combing and they are a seasonal heavy shedder. They are a generally very healthy breed although can suffer from digestive problems.