Hang Loose, you might have read this, this is just one description that I've found.

http://www.dogbreedinfo.com/greatpyrenees.htm

What I'm reading into this is that if you want to get one, make sure you get a puppy and have it grow up in your home environment, don't get a rescue dog like Mason. You've got the room and the fence and are used to having larger dogs.

Another site says that they are pretty vocal, so if you don't like a barking dog, then it may not be the breed for you.

www.hoosierpondpros.com

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3/4 to 1 1/4 ac pond LMB, SMB, PS, BG, RES, CC, YP, Bardello BG, (RBT & Blue Tilapia - seasonal).