My cat had mats too - my cat is the grossest cat of all time, incidentally. But still pretty cute. Anyway, we shaved them off with clippers (got some cheap at Target) and then put the cat (Sammy) on a diet. See, he got pretty dang fat. So fat, in fact, that the vet said that maybe he couldn't clean himself properly. He’s lost a bit of weight and he's been doing better even since. Plus, now he wears medium cat pajamas (with little different-colored penguins on them), so that's a plus. What I'm trying to get at here...is your cat a fatty? Here's one way to tell - when he/she purrs, does he/she lose his/her breath? Also, do people point and laugh? Fuckers (if they do. Actually, fuckers if they don’t too). Anyway, try putting him/her on a diet. Another thing - sometimes cats stop cleaning themselves when they get depressed. Here's one way to tell if you're cat is depressed - has it stopped accessorizing? Anyway, sorry I know probably too much info about cats. Any kind of cool I had going for me (which was not much, let's be frank), now obliterated.