Simple, tell her your dog won't be wearing a choke collar to attend the class and if she doesn't accept that, then tell her nevermind you don't need her class. My dogs never had puppy classes and they heel, sit, stay, and are well behaved in stores in public, and on the leash. So you don't have to have the puppy class. A little time and treats are all you need to really train your pupy if that lady is going to insist on a choke chain. My dogs have never worn anything but a flat leather buckle collar for any training. You of course need to do what you think is right but I would not let someone force me to put a choke chain on my dog or puppy just for some training if I thought it was wrong. Good luck, I hope it works out.