DO NOT BUY, read, or in any way follow instructions from ANY book / trainer / program that advocates hitting a dog, inflicting pain, or causing fear under ANY circumstances. This is deliberate abuse &, aside from that immoral aspect, will create a dog that’s fearful, potentially aggressive, and just plain emotionally, mentally, & physically damaged.
I have been working with dogs for over 25 years. This would have been considered abusive even back when I began.