I have enrolled in an Obedience class and went one week and then had to miss two weeks because of holidays. In that time i read culture class and really learned alot about dog learning and training.
The class is a "positive reinforcement" class and i say it like that because it does use treats and praise, but they also want you to use a choke or prong collar. there are alot of leash corrections that they instruct you to use.
When i came back to the class, there was a lady walking a young german shepard before the class started she was yanking on the leash hard non-stop and when the dog crossed in front of her she kicked it in the face! i couldnt believe it. Now i know alot of people use choke collars and prong collars (my mother is one of them) and i see that then can be used causing minimal pain to the dog, but some people dont mind that their dog is terrified of them and that is why it is "behaving"...
sorry just a rant!