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What you will need:
Bells (small jingle bells or craft bells will work)
A length of sturdy string or ribbon to tie or sew the bells to.
Be sure that the string or ribbon is long enough for your puppy to reach with his nose or paw so that he can ring them. Sew or tie the bells firmly to the string or ribbon, you do not want them to be able to fall off and cause a choking hazard for your pet. Affix the bells to your door, being sure your puppy can reach them.
To get your puppy to associate the bells with going outdoors, be sure to ring them every time that you take your puppy outside. It will be especially helpful if you can get the puppy to ring them when you take him or her outside, however, even if you are doing the ringing, be sure that the bells are rang each time, then open the door to go out. After a few days of this, most puppies will learn what the bells mean and you will soon hear the bells ring and find your puppy waiting patiently by the door.
However, if your puppy is not learning to associate the bells with the door, he or she may need some positive affirmation in the form of treats. For more info on this visit: http://www.wikihow.com/Potty-Train-Your-Puppy-Using-a-Bell