I'm another one of those that had to take the bell away. They learned it FAST!! Then it was being rung just to go outside. I started ignorning it sometimes if they had just been out and my oldest would ring it and turn around and look at me, then ring it again, harder. It did have the side effect that if they really needed to go out they were persistent, so once I took the bell away they just asked in their own way - pacing, whining, barking - depending on the dog. So I guess in it's own way it was good as it taught them that they really needed to let me know in some way rather than just standing there or peeing on the floor.