Your dog will no longer have to bark, whine or scratch at the door to let you know when he/she needs to go outside. Eliminate accidents in the house by giving them a way to communicate to you that they need to go. * Training is fast and easy. * Works with dogs of all ages and sizes. * Comes with easy-to-follow training instructions. * Fits over doorknob, or can be placed on a hook. Hanging decorative charm may vary in color, but will be the plastic dog silhouette charm.