Isn't the great Pyrenees flock dogs? I would go with them. I had a pit bull...trust me that did not work well. He was a pup and still...I can only tell you of my experience with him. I am sure some would do ok. The only drawback with a great Pyrenees might be they are too large for the home.
More info:
http://en.wikipedia.org/wiki/Great_Pyrenees
More info:
http://en.wikipedia.org/wiki/Great_Pyrenees
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