I have a couple very fluffy, soft, huggable medium/long-haired 10 month old kittens. I need to start grooming them better and am considering a Furminator. I hear a lot about big piles of fur after using it.....would this thin the cats' hair out so they aren't as fluffy anymore? And how does this device work - it wouldn't make their fur any shorter, would it? I just don't want to ruin/thin out their pretty coats.