Sophie is trained to ring the bell to go pottie! Just like others, she was terrified of the sound at first! We were persistent and kept ringing it with her paw every time she ate, and said the words "let's go potty outside"! Sure enough, after about two weeks of making her ring the bell every time she went out to potty, she started ringing it herself! It's funny now, because if you don't come quick enough, she'll ring it 2-3 times and then look around for you!
It really does work, because we even take the bell with us when she comes to the office or on a weekend trip in the RV! Just be persistent, and it works!
Sophie's Mom