Wow, first time on this thread.... I am an animal trainer... trained lots of animals, in the most positive, contructive way.
Clicker training is awesome, corrective collar training is great for dogs too. IF used correctly. You are not supposed to choke the dog. As for the chain corrective collars, they should have an instructual manual with it because they can be put on backwards and crush the lyranx. It should go on like a "P" facing the owner, not like a "q." I don't have the time, nor do any of you for me to write a 25 page note on how to properly use a training collar. But you can use a training collar, voice commands, hand signals and a clicker and get the same results depending on YOUR knowledge of training.
As stated above by someone, ALL DOG/ANIMAL training should be postive, and positive reinforcement is the answer.
Also, NEVER train any animal/pet and leave them with a negative ending, ALWAYS end on a postive note, and reward. Even if it's a simple command. Animals, not just elephants remember, and no one wants to feel bad. If anyone gets anything I am saying, please get that you end on a postive note with your pet. You will reap the rewards later and make an animal happy along the way.