Why teach your dog to bark or scratch at the door when it's so easy to teach him to ring a bell to ask to go out? Train your dog to ring a bell and speed up your housebreaking / housetraining (and guests will think your dog is so clever!) 7" tall, extends out from the wall 3.5". Metal is 1/2" wide and bell is 1.5" in diameter. Made in the USA!