My local kennel club offers basic obedience classes (sit, down, stay, heel, stand for exam) - 6 weeks, $60, one hour each week, all positive training with a fitted nylon slip collar (dominant dog collar). We usually start out with 8-10 people for a session (sessions are usually back to back). By the end, 25%-50% of the people have given up...it's not from lack of effort on the instructor's part! And it is usually the most out of control dogs.
One can only guess what happens to the dog after that...