The Coachi Toilet Training Bells help make toilet training easy simply train your dog to communicate when they need to go outside. Perfect for all puppies and dogs. They help provide a clear consistent method of communication. Start by rewarding your dog each time they touch the bells & progress to letting them out for a play & toilet as required. The bells are adjustable in length to cater for all breeds and ages of puppies and dogs. Simple to adjust we recommend that the bells are positioned at your dogs head height.