I second this! If you are using a harness on a dog that is not trained to walk loose leash you are only asking for trouble! It will only assist the dog in pulling harder and more. If you want to use a harness try using a Easy Walk front clip harness to assist with training your dog. I use it on Novie and helps alot! Far too often I see owners putting the dog in a harness from the get go, and they wonder why the dog is so strong when they pull!But I would only suggest getting a harness for dogs that are well trained on the leash and don't pull !