Misty has started rubbing her butt on the carpet. She never used to do this, but now I see her do it several times a day. Her rear does not look irritated at all so the only thing I can think of is worms, but I haven't seen any. I've spent a small fortune on vet bills for all my pets over the past couple of months, so I'd like to have an idea of what I'm dealing with before I take her in and have them charge me $50 to just look at her and say her skin is dry or something simple. Any ideas would be greatly appreciated, I'd like to avoid a vet trip if possible but if I can't I'll take her in the next day or so.