Originally posted by Cinder & Smoke

Eddie ~
It better not be *YOU*!!
I second that, although no matter who it is it's bad enough.

Tubby once took to peeing on my dad's side of the bed. My dad and Tubby didn't get along to good, and I think this was Tubby's way of showing exactly what he thought of my dad - but it most certainly wasn't a good idea! I was told "one more time and that cat is gone!" So my mom put a big heavy sheet of plastic on my dad's side of the bed. Thinking 1) Tubby won't like the feel of the plastic and will stay off, and 2) even if he does still pee, it won't be able to soak into the bed. The good news is that from that day forward Tubby never peed on the bed again - or anywhere else except the litter box for that matter.

So, like Phred says, it might not match the decor, but for the time being, to hopefully help solve the problem, maybe you could cover the entire dining room floor with a piece of heavy plastic. I'm not really sure, but I think you can get big sheets of plastic at Home Depot, or a hardware store. That way, even if whoever is doing it continues, at least it won't soak into the carpeting. And maybe, possibly, like Phred says, put a litter box there also, so whoever is doing it might get the hint, and hopefully doesn't decide to move to the living room or elsewhere.