A dog leash is adapted to assist a person in teaching, reinforcing and testing a learned behavior to a dog. The aid is especially effective in teaching a dog to watching and focusing on the head and/or upper body of a handler of the dog. The leash includes a chin controlling member that is placed under the chin of the dog and a guide connected to the controlling member. The handler and the dog can control contact between the dog and the chin controlling member. Methods of using the leash to allow the dog to focus on the handler are also described.
