Sorry to hear that!

I also have no idea what to tell you except that he seems to be not very comfortable in a multi-cat household (although he's used to it, but obviously has a very strong need to mark).

Try this site as well, they are excellent

http://www.cathelp-online.com/forums/index.php

What tests have you run with your vet? Urinalysis? Maybe other tests should be done as well.

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