This is NOT meant as an attack on you or your post but we like big dogs and actually looked in to this breed.
From the article: Though not trained to attack people, the dogs, both white Great Pyrenees, were fierce protectors of Robinson's herd.
What kind of idiot rides screaming at speed into a flock guarded by this kind of dog?
Those are definitely not the kind of dogs I have seen herding sheep in the Rockies. I am sure that if two of those were after my hide I would be scampering up a tree. But I doubt that I would set them off in the first place. Beautiful dogs BTW.
About a month ago we were deer hunting way up next to Oregon in Nevada. There was a herd of about 5,000 sheep being watched over by a Great Pyrenees. He was magnificent to watch at work. Very impressive animal.