The pinch collar is physically better for any dog's neck. Unlike a choke chain, the pinch collar gives even pressure all around the neck.

If either collar is abused, then they can cause harm to any kind of dog.

You have to make sure that the size of the correction fits the size of the dog. If a correction I gave to a Toy Poodle had the same strength as one I'd give to a Rottweiler, I'd feel sorry for that Poodle.

Also, if you gave a Rottweiler a Toy Poodle correction, you'd never get anywhere.

I know a 9 pound Boston Terrier that regularly wears a pinch collar for training. The size of the dog really doesn't matter.

If you use a pinch collar correctly it is a wonderful training tool.