The existence of this book makes me laugh.
Featured prominently in Terry Practhett's best-selling fantasy slapstick series, Where's My Cow is the picture book that Commander Vimes reads to his son every night in Thud!. It's also a book about that book. Dizzying, I know! Yet not necessarily worth it for those who aren't already devoted fans.
It's fun, I'm glad I read it, but I don't know how suited it would be for real kids. And Vimes doesn't look at all like he does in my head.