I looked around online and found out that tapeworms are not transferable from cat to cat. So I feel much better. But I'm still going to get Corky tested just in case. And the lady at the shelter I got Tibby from also said the same thing. The lady at the shelter was so nice, she offered to pay the vet bill since she obviously had it when she lived at the shelter too and she just didn't diagnose it. But I told her that Tibby is my cat now and that's it's ok. WHen you adopt a can especially from a shelter you know that you may have to spend a little money at the vet when you first get them. And plus she works so hard to keep her shelter, she works only on donations and her own hard earned money. I told her it was silly to offer to pay the bill.