I'm sorry to hear this. He could have a UTI which would be painful so then most cats will pee in places other than the litterbox. Yes, I would try to bring in a fresh sample of urine to your vet and then hopefully he'll be able to tell you more. If it isn't Spunky then you'll need to investigate further to see who it may be. Since cats don't usually drink enought water, it's good to feed them some canned food daily. I don't know if you're doing this with Spunky or not. Good luck.