The breed is quick, intense and tireless, and forms a strong attachment to its own people while tending to stay reserved with strangers. Its speed and agility have made it a capable competitor in dog agility, far from its mountain origins.
It is a small, lean, wiry dog with a triangular head, almond-shaped eyes and a keen, alert expression. The coat may be fawn, grey, merle, brindle or black, sometimes with a little white. In the rough-faced variety the hair can twist into loose cords on the hindquarters, a texture often likened to goat's hair.
The Pyrenean Shepherd stayed a working dog of the high valleys long after its service in the First World War drew attention to it. A breed club formed in France after the war drew up a standard based on the dogs still working with mountain shepherds. Two varieties are recognised. The rough-faced dog has a longer coat. The smooth-faced dog has short hair on the muzzle and face. The breed's job was to gather and move large flocks over steep, broken ground, working closely with its shepherd while larger guardian dogs dealt with predators.