PoochieBells, The Genuine Dog Potty Training Doorbell. PoochieBells in our EcoFriendly Bamboo webbing provides the ultimate in durability. PoochieBells conviently hang on all doorknob types where the family pooch can lean to ring when its potty time. Easy training instructions included, proven results in days. Professionally endorsed by pet professionals as a convienent and easy way to housetrain the family pooch.