We have one of our rescues "Samar" she is not a big fan of being brushed. The issue is that her fur is very dense and it begins to look terrible almost like there are cigarette buts of fur on her. She recently allowed a lot of brushing for her (about 5 minutes) and I was able to get tons of hair off of her and the "cigarette butts" as well. Problem seems to be much worse going towards her hind quarters she will hiss and meow when we try to brush where she can't see and she really needs some grooming. Any thoughts would be great.