A strong sport dog doing a good bark and hold. If you don't enter this work with a clear understanding of which road to take you will get lost. New trainers in the sport of schutzhund or service dogs often misunderstand the concept of bh training. The correct bh is developed as an adversarial relationship between the helper and the dog. It is not developed in prey drive where the dog is trained to bark for it's prey, although this is certainly a viable way of training dogs that lack the nerve to do it properly.
Lets take a second to talk about prey bh.
A dog that barks in prey creates a picture of a dog that comes to the helper and barks in a controlled high or normal pitched bark. The image the dog presents lacks intensity. It is not the picture of a dog creating a serious threat. Today s schutzhund judges expect to see a strong serious defensive bark in the dogs. They easily recognize a prey bark for what it is, which is either a dog that lacks nerves or a dog that was poorly trained.