I must disagree with that statement GSD.
Having a dog that would rip someone's face off over a correction is not a good thing. Sure, you have a special feeling when you know that your dog listens to you better than anyone else, but a dog that's training for SchH should know what to determine as a threat and what isn't it.
Was it a pop on the leash?
To be honest we all thought it was a bit cute, (before we started going to school, when Roxy was a pup) when Roxy showed her teeth. She never bit anyone or ever looked like she was going to bite. Most of the time we thought she was playing.
And now I'm paying for it. I'm paying for not socializing her with other people like I should've when she was younger. Paying for it, with my time, my nerves and lots of money.
I don't expect or really even want Roxy to just listen to anyone. But I also don't want her to be an "unpredictable animal", who poses a danger to the public and ultimately herself.
Roxy definitely shows her dislike if my trainer corrects her while demonstrating something. Whether it be a "smile" or low growl, or sometimes even just a look. But unless my trainer went to grab her or hit her that is all Roxy would do. She knows that there would be serious consequences for biting someone. Usually there are serious consequences for even "smiling", usually a very firm, loud, angry correction, and she slumps submissively because she knows that is not allowed.