We started following Cesar's methods two years ago when we bought a new puppy. I had owned many dogs over the years, and thought I knew what I was doing when it came to training, but once we began adopting Cesar's methods it put everything in a new perspective. Cesar teaches you how to be the pack leader, and it is miraculous the impact it has on the dog. He helps you understand dogs, and once you do it becomes very easy to mold them into the ideal pet and companion. And his mantra of "calm assertive energy" is a great lesson for life - not just in how you interact with your pet. Using his methods we have molded our puppy into a terrific, happy, disciplined, calm companion - and I now have the best relationship I have ever had with an animal. I strongly recommend this series for anyone that has a dog or is considering getting a dog - or even if you have to interact with dogs. In fact, before learning from Cesar my wife was afraid of dogs, and now that she understands them it has added a new dimension to her life and alleviated all her fears. This is a great collection!