Pinch collar = Prong collar. I was horrified when I first hear of them, but they work great when used as intended, and not as a instrument of torture. Unfortunately, none of the obedience trainers around here will let you use them.
Aubrey is a setter-mix with a little bit of suluki thrown in, fast as greased lightning, and prey-driven as though she has never been fed in her life. She and her pups were dragged from under a trailer in NW Missouri, and taken in by a rescue group, prior to that she had been hunting food for her pups. She was very unsocialized when we got her, but not the least bit aggressive, she just shut down. She is very much improved in terms of socialization, but still prey-driven.
Our first rescue was a Golden/Brittany mix we got when she was 5 years old. She was a wonderful dog; we lost her to lymphoma at 10 (sigh).
They certainly do work. And sharpening a couple of prongs helps with big dogs that have a thick ruff around their necks, like Goldens. And they don’t hurt the dog.
I only used mine at training, or when we traveled cross country, stopping at rest stops where he might meet strangers.
I don’t like shock collars, however. At least not for Goldens. My trainer wanted him to have one (that was $300 wasted) so that I could train him to never chase deer. But, he did not react well to it, and I just put it away.
Funny thing, the books tell you that the dog will never associate the shock collar with the owner, or trainer. My dog was smarter than that, and I found is that all you had to do was to put on the controller around your neck and he behaved extra nice — no collar needed. Then I found that my flash drive that hung on a lanyard around my neck would work just as wall. When he was misbehaving, all I had to do was to show him the 2 inch flash drive, and he settled right down.