get yourself a small cow bell, tie it near the door you are going to use to take the puppy out on a string low enough they can reach it with their paw or nose, everytime you take the pup out you ring the bell and say the same cue< "we are going outside to pottie", then do this every 2 hours, you'd be surprised how soon they will be ringing the bell themselves. and it is so cute. Our pup would get really loud with it if we didn't hear it the first time or come fast enough. good luck!