Because your cat is obviously being treated for the cardiomyopathy, your vet is perhaps the best resource for help with this problem. I have a strong feeling the two are inter-related especially since the cat seems to be on some form of diuretic. There may be some problems with the way he feels when the urge hits that is causing the choice of other things.

I would recommend you discuss this problem with your vet and perhaps seek out the advice of an animal behaviorist. In the meantime you could attempt to retrain the cat to the litterbox which requires that you keep him in a small room or large cage with only the litterbox, bedding, food and water. Usually cats will use a litterbox rather than soil their territory. When the cat seems to be consistant in the use of the litterbox, then you can expand his territory and see how he does.

I am not sure Feliway or Comfort Zone will work in this instance, but they are both worth a try. Also carpet runners (those plastic things that people use to cover carpets in high-traffic areas) placed upsidedown on things can often discourage cats. Those little "feet" that are supposed to grip the carpet don't feel good to their sensitive paws.

Good luck!
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Smile, it will make them wonder what you are up to!

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