The training steps:
steps 1. Hang the doorbells on the door or a suitable hook next to the door. according your puppy height to adujust the adjust the belt length to the bottom of the door or wall, make sure it iseasily reachable by your dog.
Steps 2.When you take your dog out, bring them to the doorbells, give your dog an order and use its claws to touch the bells. Then provide positive verbal feedback and take your dog outside.
Steps 3.Repeat the process again and again when you take your puppy out, and always give the same command and praise. Three weeks or shorter, your dog will remember this way, and communicate with you by this way when they want to out.