I love dogs as livestock guardians, and both breeds are popular around us, though Pyrenees has always been my favorite of the two. Our dog Lolo is half Pyrenees, as his mom was purebred.
I'd still like to kick myself, because our neighbor across the street used to breed them, and there was a female in his last litter that became Lolo's best friend. I don't think they were purebred, but they were mostly Pyrenees, and protected his sheep . . . he never lost one to a predator. She even walked down to the barn with me on a couple of occasions to help me check on the goats.
Unfortunately, just about the time I decided to ask for her, she disappeared. . . he had already found a home for her. Lolo was heartbroken, and kept looking for her everywhere. I missed her too. She was a sweetheart, beautiful, and really good with the goats.
Your new boy is a beauty, and I have no doubt you'll have gorgeous pups down the line.