I'm knocking on wood as I say this, but thankfully, I have never had a cat get an URI before! Never! I do hope that Corky and Tibby will get through this, unscathed, and be feeling better in no time! I'm glad you got an answer on Tibby's clumsiness too. I know it helps for you to know what is wrong, even though it is a sad diagnosis. I noticed a while back that my Mimi was having some problems negotiating the jump up to her food bowl, but we decided hers is more of an age thing. She will be 14 in June. So we just helped her out by putting a chair beside the counter, so she can make two small jumps, rather than one big one.

Get better soon, Corky and Tibby!!!