This book is great for the new owner, or someone who doesn't know much about dog behaviour. I found it very simple, but although I have many other more in depth books, I continually refer back to this one as a source for reference in my canine behaviour coursework. It would have got a 5 but I do have better books that definately rate a 5 so 4 is fair.Its simple enough for children to understand too, so great for the family getting a pup or dog to help them understand what the little guys trying to say!