This is the must have book for anyone that either owns or trains dogs. Many professional bodies should read this book and take note that the days of "jank and crank" should be confined to the dustbin. This book makes more sense the more times you read it. I have lent my copy to many people and not one has come back to me with a negative comment about it. So much have they said it makes sense that they are buying their own copy so they to can read it over and over again. I would suggest that by buying this book , you will do the same.