Yes... leash correction, verbal correction 'No Unacceptable', keep walking. Always keep walking calmly and remember, time patience and consistency.
The trainer in your class should be able to help with strategies for working her through the teenage terror times.
My mantra when Venus was 6 months old was 'that dog isn't going to want to be your friend if you're acting like that' Eases the tension with the other handler that you are aware of your puppy is acting up and doing something to correct it. When she'd get close to another dog in class or the rare person on the street with a confident larger dog, all she'd do is give kisses and playfully jump on their head.
Venus is 14 months now and about 2 months ago, the switch just went off in her head about having nice manners. I have a couple friendly neighbors with somewhat unruly large dogs I have enlisted to help. She no longer reacts to every dog she sees. I was proud of her for the last few times I've stopped to talk to friends with dogs, she's just watched. When the other dog barked at her, she'd bark back but settle quickly when told. They all grow up LOL
Venus of Crooked Creek 1/26/13
Otto von Hena-C 05/23/08
Morgan Donnermond 08/04/01 to 9/28/12 Long Live the Queen!
I have duct tape and I am not afraid to use it.