I'm so sorry to hear that he had to be catheterized again. I was told by Storm's surgeon that the more times a cat is catheterized the more likely that they can develop scar tissue which can also cause problems. Even though Storm was only catheterized one time that I know of he had so much scar tissue that they weren't even able to catheterize him the second time so he needed PU surgery asap. Lots more prayers and positive thoughts are being sent Caly's way.