You don't need this book if you already have The Seven Ages of your Dog and The Dog Whisperer. To be fair, Jan states this on her website so she's not trying to fool anyone. I love her stuff, she writes beautifully and she's easy to understand - important if you're freaking out over a 'problem dog' going through its routine in front of you! If you only want to deal with puppies, this book has all the info you need and stands alone. If, like me, you want to just bask in the knowledge and sensitivity which Jan brings to her work, you'll want to buy her other books too. When I got my two rescue dogs last year, I bought several books by other authors but found Jan's to be the best by far in terms of clarity and ease of application. You might want to augment the books with her DVD - it helps to 'fix' what you've learnt. I can't praise her work highly enough!