a book about dogs

When they write CATS for example on the front cover of a book I am always assuming that they mean "This is a book about CATS," but then yesterday I saw a book with "CATS" on the cover but inside there was nothing but dogs. Naturally curious I contacted the publisher. He explained "Oh no, the book is about dogs. "Cats" is just the name. This is not a great story, kind of stupid really, but preferrable perhaps to the sadistic banality of regular life.