The Pyrenean Mastiff (Mastín del Pirineo) is a large breed of dog originally from the Aragonese Pyrenees in Spain.The Pyrenean Mastiff is a very large dog, males 77 cm (30 in) and females 71 cm (28 in) at the withers, although they can be up to 81 cm (32 in). They have a heavy white coat with large darker spots. The average weight is about 180 pounds, although males can often weigh over 220 pounds.This Mountain dog is descended from an ancient livestock guardian dog type. It has been documented since 1977 as a modern purebred breed by the Club del Mastín del Pirineo de España in Spain. The breed is now being taken from its native region and promoted as a pet in other countries like USA by the Pyrenean Mastiff Club of America It was recognised by the Fédération Cynologique Internationale in 1982.