My dog now understands corrections don't mean much when his prong collar is off. Is it possible for him to unlearn this?

I'm sorry if this question has already been answered somewhere in your vast amount of information. I searched in your articles and on your Q&A, but my eyes are starting to cross from all the reading! I started training Spencer (2-year-old Dobe) with a prong collar about a year and a half ago. It was a life-saver for him because I wanted to wring his neck every day. There are no trainers in our area who will use a prong collar (they all favor the Gentle Leader, which Spencer hates), so had to go all the way up to Massachusetts to learn how to deal with my wild man. The trainer, however, did not say anything about putting the prong collar on and off several times a day for a couple of weeks before starting the training. I just watched your Basic Obedience DVD yesterday where you suggest doing this with the prong collar and also the e-collar which I have purchased but haven?t started using yet because I want to make sure I do it exactly right. The more I learn from you, the more I realize how much MORE I need to learn! Anyway, being a pretty smart dog, it didn't take Spencer long to figure out that if he doesn't have the prong collar on, the corrections don't mean much. Is it possible for him to 'unlearn' this or is it a done deal? He's a great dog, therapy certified, with no behavioral or temperament problems. He's very cooperative and will do what I tell him if he understands clearly what I want. I think I have botched the prong collar training from the beginning, so if I could ?re-teach? it, I'm sure he could 're-learn' it.

Thank you for all your help. Your DVDs (I think I have 5 or 6 of them now) and articles have made a huge difference in how I?m training Spencer. Your methods are so much more common-sense, simple but not easy, but well worth the effort. Spencer loves to train, and your information has given me so many fun ways to work with him. I have taken obedience and agility classes with him just to exercise his body and mind, with no intent to compete. Now I'm starting to think that competing is a very good possibility with your clear-cut methods to guide me. Pretty exciting prospect for an old lady of 64!

Judy