go to theisens or any farm supply store or craft store and purchase a small cow bell, tie it on a string/shoe string low so the puppy can move it with their paw or nose by the door you take them out to do their duty. everytime you take them out ring the bell and say " going outside to potty" or something simlar to that always the same thing, in no time they will be ringing the bell when they have to go outside. good luck with your puppy they are great company.