Just thought I'd give a quick update....he hasn't had any accidents since that day that I first posted this thread. I think a combination of me finally catching him to correct him, us being more strict about cutting down his access to the whole house and being more diligent about taking him out during the day have really helped. I never did buy the bell...I'm going to see how he keeps progressing and if he doesn't keep doing better and better, I'll probably buy one.