We have three cats. We have found cat pee in a few different places in the past week and are trying to figure out which cat did it so we can pay a visit to the vet. One time I did catch a cat in the act, and it was our usual culprit who has a history of doing this, so it is probably her. But our other female cat has been acting off/maybe sick lately so it could be her. How do you figure out which cat is the trouble maker if you have mutliple cats?