Thank you for sharing that story! It is very telling about the level of stupidity of some members of our society. That lady probably is a card carrying member of PETA and if she happens to own any animals I will bet that they are basket cases when it comes to behavior. I too use a prong collar for training and correction of large strong dogs. It works.
Good news is that the Golden Valley Sheriff seemed to be quite reasonable. Living out west but not too far west (Cali) you should enjoy many more individual freedoms and not have to put up with crap like that. It may be time to move to Texas. :) You just gave me an idea for a photo contest! :)