My Tawny had a bladder infection this past spring, very nasty, she wanted to go out all the time and try to pee, but it was painful for her. It took about 3 weeks to knock that out with anti biotics, get to the vet. I didn't wait but we had to increase her medication and they did check for stones because it was a tough one to clear up. When it gets bad they have blood in their pee. It really burns them. So I think you should have Muffin checked out. Heres hoping Muffin is ok.