My inlaws have had 2 Pyrenees. Beautiful, sweet, and affectionate dogs, BUT...absolutely worthless as a guard dog or what your intentions are. LOLWe're considering a Great Pyrenese or similar shepharding dog to guard our chickens and goats. We have a donkey with them now and she is 100% useless. She has stood by while 23 chickens were taken by coyote and another by a hawk. I don't really expect her to do anything about a hawk but I don't understand why she just stands there and watches while a coyote, somtimes several coyote, circle the pen and jump in to grab a chicken.
This would be an outside dog for the most part, considering the role to be filled.
In my humble opinion, get you a heeler/Australian Shepard. They are available everywhere around here, super smart, extremely loyal, and have an amazing shepherding intuition.