I'm sure this subject has come up before, but couldn't find what you like best for stopping a puller. Holly is 4 1/2 months and I know a lot of it is puppy and being excited when she goes out for walks . We are fine after she settles down with just a plain nylon collar, but going to puppy obedience class or being around other poeple or dogs---no way! I got the Sporn No Pull Harness and at first it seemed to work, but now she pulls like a husky in it. I know to release when she gives in and I do changes in direction and have also made her sit until she quiets down. I reward and when she in a regular collar I try a quick pull to the side to throw her off balance, but nothing seems to sink in or should I say she isn't buying any of my efforts. Is this a case of hard work and her maturing will help or is this a case that I need a different collar such as a martingale or prong collar? Thanks for any help.