Only if you want to make it more comfortable for your dog to drag you down the street. Think about it, what do they put on sled dogs to allow them to pull heavy sleds - right - a harness. A harness will not teach a dog not to pull, it only makes it easier for them to do it. It is much better to teach a dog to walk with us without pulling. For very strong dogs we recommend using a Gentle Leader collar. It works very much like a halter on a horse. If the dog pulls away from you, the collar pulls him back towards you. It gives the handler instant control of the dog. While there is nothing wrong with using this device for the life of the dog, we suggest that your goal should be to train the dog to walk with you.