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http://www.clickertraining.tv/product.html?item=FREE-09
molly said:All 4 of our dogs and our cat ring the bells to go out. Consistency is the key. Each time they touch the bells/ring them, you will need to open the door and let them out (must be harder when you have to leash the dog and take them for a walk). The reward is the open door! Usually, they will ring the bell many times in the beginning. Soon though that novelty wears off and they will only ring when they need to go out.
Our Casey is really funny. He will madly ring the bells when he wants out. If we don't respond right away, he comes and finds us, stares at us as if to say "Are you deaf?" and runs back and rings them again. :badgrin: