I think you can retrain him if he was an indoor cat. I bought scat mats years ago and they work really good for training a pet to not go in a certain spot like counter tops, couches, front doors. They let off a little shock, nothing painful, I know I tried it out. It's just enough to make them back away. Maybe those would work to lay by the door he goes out and he'll want to stay in more? Just google Scat Mats for pets. I still use mine on the counters at night because Rick is a stinker about jumping on them when I'm not looking. He's so trained that when he sees the mat come out he turns and walks away. Is Cedric fixed? If not, maybe get him fixed. That may help if he's wanting to get out.

Did Cedric possibly get into it with a skunk? Does he have his rabies shot up to date? If so, he should be fine but if not you may want to take him in to be checked. I've heard tomato juice, vinegar or honey is something to try. Maybe put it on a wash rag and wipe him down? If it wasn't a skunk I am not sure but at this point I am sure your willing to try anything even if it wasn't a skunk. There is a spray you can buy called Skunk Off that has been given great reviews. Maybe call the pet store or vet and ask them? Better yet, maybe take him to the vet and let them bathe him?
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Whatever you do, good luck!
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