It was unbelievable!! My two Corgis are barkers and I have tried it all!! By the and of the session, they were not barking at the doorbell; this had never happened before . . . and so quickly! I was in shock! Very good step by step and easy to follow directions. I have never felt like the pack leader before and now I AM, and with just a growl -- it is a feeling of power and my dogs seem calmer and happier. The true test was the next morning. Annie had always barked from the time my alarm goes off until she is outside. I gave one growl and she was quiet the whole time! Incredible! I am sold on this method and will spread the word!