Litterbox Aversion

[kimluvspyrs]

My 7 year old, neutered male cat defecates on our dining room floor every day. This is the only room in the house where he chooses to do this. As far as we know, he does not urinate outside of the litterbox. We have moved furniture around, and recently added a large rug that covers a large part of the wood flooring. When we consulted our vet, we were told there could be lots of reasons and that it is hard to determine. She said it could be behavioral or that he has some colitis and associates discomfort with the litter box. Has anyone else had this issue??? Help!