I just dug out and re-read my dog-eared Koehler, copyright 1966. That is what we did back in the day. I have to say, our local dog training club used these methods, and so did I, with several dogs at that time.
I am the first to complain that dogs today are not as well trained as dogs trained by these methods back in the day. I especially notice it on the stays at obedience trials.
However, it came at a cost. The force and violence of these methods, and the compulsion, were not something that all dogs could tolerate. The wolfhounds tended to assume a “captive lion made to do tricks” demeanor, humiliated, unhappy, not a good thing.
Dogs are incredible, in that so many of them will become trained no matter what methods are used.
But, just think if you tried to apply the Koehler methods to cats, chickens, dolphins, etc…you would not get very far.
It is very militaristic…which works better for some people, and some animals, than others. Some thrive on this, others do not.
When I started doing the more positive/clicker training for the wolfhounds, they responded so well, and it was so much more enjoyable for them, and for for me.
It was very much more a partnership, where we worked together, and have had great results. But, you must follow through with these methods, and proof, in order to get the reliabilibity. This is a step which is all too often neglected.
Most of the books I have focus more on training for competition obedience, or puppies, so I am not good on books for adult training with an emphasis on agility training, other than the Sue Ailsby books which are good for anything. The Chris Zink books are great for agility, though they focus more on physical conditioning than actual training.