I thought that I would add my 2 cents on prong collars. I have an Alaskan Malamute which were bred for sledding. I got him from the Humane Society at about 2 years old. I have no history on him, so I don't know if he was trained for sledding by his previous owner. I tried the choke chain on him at first but he would pull so hard that he left himself gasping for air. I searched the internet and found that most sites said the same thing about stopping him from pulling " Unless you have a lot of time, if you can keep your Malamute from dragging you down the street, you've won". I had misgivings on the prong collar, but tried it anyway. The results were great. He still pulls but not hard. It doesn't hurt him or he would not continue to pull. They are a form of torture only when the human on the other end yanks on the leash as a form of discipline. As long as you use it as it is intended, it can solve the problem of pulling.