I was just wondering why I haven't thought about this before but mindlessly dealt with it and cleaned it up. Mew-mew my cat is a year old and for half a year he has had mucus (brown-clear) with sometimes a trace amount of blood in it. (not too much just a hair-literally looks like a red line) It usually stuck to his behind and I had to catch him before it became stuck to the bathroom floor where I have his litterbox. I read online that it may be a parasite (worm or who knows what else) but I remember giving him a dewormer when he was little and nothing happened. (stool was same) Since he had no behavioral changes I assumed everything was alright and school took up my priorities and I forgot about it. It still occurs and I think it could be a number of things but I'm not sure including: maybe I don't feed him enough (I feed him with a small disney cup and I usually feed him half of that)http://www.antiquemystique.com/pages/665_jpg.htm => looks like the one on the right. I can feel his hip bones so does that mean he is underweight? (what are the conditons that would deem him underweight) I do feed him the same amount that I did when he was little. parasites - worms (any other? I hear giardia can cause it as well) note: I am planning to bring him to the vet.