In answer to the question ... Mouse is actually somewhat resistant to magic of all types. His type of dog is bred to fight demons (Harry acquired him as a puppy by accident) and while the book has never gone into what his specific abilities actually *are* -- beyond a few vague hints -- it seemed plausible to me that he wouldn't be affected by a spell of this type.
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In answer to the question ... Mouse is actually somewhat resistant to magic of all types. His type of dog is bred to fight demons (Harry acquired him as a puppy by accident) and while the book has never gone into what his specific abilities actually *are* -- beyond a few vague hints -- it seemed plausible to me that he wouldn't be affected by a spell of this type.