The Pyrenean Mastiff (Mastín del Pirineo) is a large breed of dog originally from the Aragonese Pyrenees in Spain. It should not be confused with the Pyrenean Mountain Dog.
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 81 kg (178 pounds), although males can often weigh over 100 kg (220 pounds).
This strong, rustic breed is self-reliant and calm. It is even-tempered and docile at home and is protective with children. It is gentle with other dogs as well as other pets and people it knows. However, if challenged, the Pyrenean Mastiff will not hesitate to defend its family or itself from a perceived threat. Although it is gentle and kind with a loving temperament, it takes its work seriously and needs a strong, experienced leader. Certainly this large breed should be socialized from puppyhood to encourage confidence, but it will always be in its nature to remain suspicious of strangers.
The Pyrenean Mastiff should be trained with reward-based, positive lessons from as early an age as possible. This teaches it to pay attention to people. It is generally an independent-minded dog, and may not respect the owner if the owner is too passive.
Source of information: http://en.wikipedia.org/wiki/Pyrenean_Mastiff
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