I see your point; but you are probably going to have to have an ideological confrontation with her at some point. Maybe play dumb; tell her you researched collars after your discussion and based on what you found *hands her a stack of printed papers* you are not comfortable switching to a potentially harmful training method; when the one you were using appears to be safer and while definitely gentler...is sufficient for your dog. I did a quick google and here's a start: http://www.boxerworld.com/forums/vie...of-collars.htm Choke ChainsThis is the common name of the metal training slip collar. Choke chains are still used as the primary training tool in many "traditional (jerk & praise)" training methods - when the dog is given a yank if it does not obey a command. A study done in Germany showed that choke chains cause a great deal of neck, back, and tracheal injuries to dogs. Prong or Pinch CollarsThese are used for the same purposes as the choke collar, to "correct" the dog by yanking on its neck if it does not comply. The prong collar is actually far safer than the choker - the study in Germany mentioned above also evaluated prong collars, and found no neck/back/trachea injuries as a result of correct use of this collar.