And figured it would be very well received here! Some info and ammunition for all of us positive trainers who never use correctional based collars It's a long article, based on studies done about Choke, Prong and Shock collars. Very good information/ammunition against the use of these [torture] devices
http://www.dogdaysnw.com/doc/overall_collars.pdf
http://www.dogdaysnw.com/doc/overall_collars.pdf