My old border collie/retriever mix wouldn't let one of those get near her, she didn't like the noise.
I ended up buying this special brush that's designed for hairier dogs and it's suppose to remove the loose fur from their inner coat and it seemed to work pretty well
*side note I put a dip in about 3 mins ago and apparently didn't brush my finger off enough because I wiped my eye mid post and now it's burning like crazy
TL:DR I think I just sacrificed my eye to make this post