This actually sounds a LOT like what my husband and I are going through right now. Mr. Spock has been pooping beside his litter box for about a year now, maybe a bit more. It's driving us both mad, especially my husband. I'm the one that has to clean it (he won't touch the stuff!), but when he comes home to a stinky smell before I get home, he's not a happy man! Luckily, Spock has only peed a couple of times outside the box, and that's been usually in a pile of laundry or something. We're both at our wit's end. We love our boy (he was the first kitty we adopted after getting married), but it's getting really frustrating having to clean up poo all the time! We're wondering if he might be happier outside. But I'm in the same predicament you are, because we can't let him out at our place. There are stray dogs around, and we live pretty close to the road, and people drive 45 to 50 mph if not more. I'd be too afraid for him. We have another kitty named Saki who we've never had a problem with. He and Mr. Spock get along wonderfully. Spock is affectionate, but only when he wants to be. I'm just not sure what his problem is. I feel your pain, and I'm sorry we're both having to deal with this! I don't know if I could handle giving him up unless it was to someone I knew well. So I know how hard this decision is for you. I'm having trouble too.
One thing I was thinking about while I was reading is, what if you fed the other cat in the bathroom instead of locking up Gus? Would he like that better? I don't know if it would stop the peeing/pooping, but it couldn't hurt. Might make him happier. Just a thought.
I hope my story helped, and I hope you realize you're not the only one dealing with this! Good luck, and keep me posted!
One thing I was thinking about while I was reading is, what if you fed the other cat in the bathroom instead of locking up Gus? Would he like that better? I don't know if it would stop the peeing/pooping, but it couldn't hurt. Might make him happier. Just a thought.
I hope my story helped, and I hope you realize you're not the only one dealing with this! Good luck, and keep me posted!