Chaser, a border collie, has a way with words. She knows over a thousand of them-- more than any other animal of any species except humans. Pilley has opened the door to a new understanding of animal intelligence, one that requires us to reconsider what actually goes on in a dog's mind. Chaser's achievements reveal her use of deductive reasoning and complex problem-solving skills to address novel challenges. And the training methods can be adopted by any dog lover!