1) Kicked, Bitten and Scratched. Life and Lessons at the Worlds Premiere Exotic Animal Training School by Amy Sutherland. A great example of why you need to know basic behavior of the animal you are training to be effective and humane.

2) The Other End of the Leash by Patricia McConnell PhD. An ethologist who explains why human behavior and canine behavior sometimes just doesn't mesh well and how we can work to change that for the better.

3) How to Teach a New Dog Old Tricks by Ian Dunbar. Lure reward training and the theories behind it. A great dog's point of view look at training. For all age dogs. (with great photos) A must have for anyone working with deaf dogs.