I am unfamiliar with the breed you mentioned but had a pair of Great Pyranees who would run down coyotes.  They seemed to only kill if the predator didn`t back down.  Its rare to see a wolf where I am from.  I have also witnessed them fight a large male bobcat.  They also challenged an 1800 pound bull that jumped the fence & threatened battle with our bull.  They didn`t bring him down but had him so riled up he was easy work for my shepherds.  They kept our goats, horses, cattle &, to some extent our chickens safe.  Their biggest threat came from dogs people let run loose or that were dumped.