The bell
Ring!
We have not done a great job in many aspects of training our beloved dog Hooligan. She has really lived up to her name in many ways. One thing we did do well was train her to ring a bell hanging from the back door to let us know that she wants to go outside. Our dog trainer suggested it and it was learned very quickly. Sometimes it gets annoying because she wants in and out so often but it is better than barking or scratching.
I knew it would happen eventually - Katherine has found the bell and she is tall enough to reach it. All kids who come for a visit love the bell. Now we will have to teach Katherine not to ring it or else it will defeat the purpose of having Hooligan so well trained.