Basically, when you attach one end of a double ended lead to the front ring of a harness, you should have more steering control. As your dog pulls forward you can very gently steer your dog to the left or right which can throw it off from pulling forwards. If you combine this with some training and positive reinforcement it can certainly help or totally eliminate pulling. The other end of the lead can also be attached to the top O ring or D ring on the dog’s back and this replaces a standard lead and provides a brake. Ideally, you need to teach your dog to heel or not to excessively pull forward on the lead and this can take patience and time.