Why so much sensitivity ? I didn't think to insult anybody I just ask simple question : Do you hit your human friend with electric ? About my knowledge J had around two thousend security dogs through my hands for 25 years and more and never used any colars " That stimulate "and I am with Sarplanianc at least 25 years.Beside other experience I was instructor for dog training and consultanat for Army security dogs behavioral problems for a year, That center had around 286 dogs train to protect and attack( People ,wareouses,Country Borders etc.) Half of them were German shepards no "American Breed " and another half Of Sraplaninac ... So I have some clue.. Thank you and if you don't like my commennts don't post it.