Awful sorry to hear about the crazy neighbor who killed the mother. How in the world did he do that to a trained guard dog?
They baited her across the road (we don't know how) and then hit her with their car. Then drug her back across the street and left her in my friend's front yard. Nice people, huh?
A Great Pyr? Good heavens, they are humongous and eat like an army! My aunt Kay had one when I was a kid. My little sister rode the darn thing sometimes (when nobody was looking). As I remember, he was totally useless as a watch dog, but I'm sure nobody would have tried to harm us while he was with us. Just too big!
Actually, she's not for guarding against people. We're getting Rose to guard against foxes and coyotes. They've found out we have a buffet over here, and they've invited all their friends. Rich and I spent hours each day last summer, armed, looking for them. Totally a waste of time, because they can see, hear, and smell better than us, and they evaded us easily. But they still took my poultry. Sometimes right where I had been only minutes before. Snatched mothers right off their babies. The dog can move a lot faster than I can, and bark louder.

I'm still trying to find another one, because they work so much better in pairs. The way these two work together is one will chase or hold the predator at bay, while the other one runs to get the people with the guns. We only have 15 acres, so unless I've got the stereo blasting, I should be able to hear Rose barking and head out to see what's going on, so I think she'll be OK by herself... but I'd really like two.
She should top out at 85 or 90 pounds, and I've a lot of dogs bigger than that (my last Dobie weighed 120 and wasn't fat), so the size won't faze me. The hair might. But she'll live outside with her animals, so at least I won't be choking up hairballs in the middle of the night.

Hope you can get Rose. Send pictures when you do, please? 
I already have one! This is both sisters, about 5 months ago, so they're a bit bigger now. They just turned a year old. Rose is on the left:

~Lannie