The Great Pyrenees began as a livestock guardian in the mountains between France and Spain, where big white dogs stayed with flocks and drove off wolves and bears. That history explains a lot: they're calm, watchful, and used to making decisions without anyone's help. Many are gentle and devoted to their families, and many are reserved with strangers.
Adopters should expect a giant dog, usually 85 to 120 pounds, with a thick double coat that sheds heavily. Pyrs are independent, slow to follow commands they don't see a point in, and likely to bark at night or wander if a fence has a weak spot. Pyrs and Pyr mixes are common in shelters, and each dog's energy and manners vary.