Dog Puppy Designer Door Potty Bells, Let Them Tell You When They Have to Go Out, Training Aide Teach your dog to ring bells to let you know they have to go! The ONLY ADJUSTABLE Potty Training: Decorative Dog "Door Bells" to Signal They Need to Go Out! he 3 high quality bells are reinforced (not ordinary craft bells) that are quite loud (can be easily heard throughout an average size house). Ribbon is not only is stylish, very durable for years of use. ach one comes with suggested training tips leaflet.