Hi from California, The idea of the bells is fabulous. I think what I will do is put one on the front door and use that idea as well, because our pup has no clue how to tell us he wants to go. Just today I took him out to go and we have only one area for him that he is allowed to go, when he was done we came back to the house and he took looked at me shook his head grabbed the leash in his little mouth and trotted with me following back to his potty are and went pee and poop, well let me tell you I was dancing and his tail was wagging. By the was I am an Australian citizen, grew up in Adelaide, SA Nice to meet you. Lily