Our sweet little cat has developed a very un-sweet habit. He has started to urinate and defecate in one area of our living room. We had an older cat in the house a few years ago and he did the same thing is this spot--I thought that I had eliminated the odor but apparently not. I have literally tried everything I can think of: store-bought enzyme sprays, hydrogen-peroxide and dish detergent, vinegar, Oxy-Deep, pulling out and washing the carpet pad, shellacking the wood, aluminum foil, all to no avail. He performs these behaviors right in front of us, and it is not an area I can easily close off. I am afraid that I may be at the negative reinforcement stage. Is there anything you can recommend? I thought about "scat pads" but do not want to traumatize him. But he MUST stop this behavior. Any help?