I have used this book to train two different labrador retrievers. Mr Woltors is just about spot on with the timing of the the training. My dogs have seemed to progress just as he describes. If you want a hunting dog you can be proud of, it is the way to go. Let's put it this way, because of my dogs I have been invited to hunt at some nice clubs, including having other club members leaving their dogs home. Blow the whistle and the dog stops, yes right on top of a running bird. It is amazing to see and it works. I can assure you if you will follow the process, you too will achieve these results. I am in no way benefiting from this review, just giving you my honest feedback, from experience! Shock collars on a labrador or golden are for lazy people who are not willing to put in the time to socialize their dog. Good luck.