I had a chance to read Where's My Cow? by the late, great Terry Pratchett this past weekend. I ordered this book, and it arrived encased in plastic. Since I purchased it as a gift, I didn't open it. So my first reading was a bit of a surprise.
I thought it was the book Sam Vimes, head of the nightwatch of Ankh-Morpork, runs home from work each evening to read to his son. What Where's My Cow? is really about is Sam Vimes reading Where's My Cow? to his son. It is more than I expected.
Sam Vimes may be my favorite Discworld character. He's essentially a cop, and I understand cop stories pretty much wherever they're set. Because he is a superior character, he recognizes an interesting point about animal picture books. And he fixes it.
A review by Steven H. Silver does a great job of describing Where's My Cow's artwork. I agree with Silver's conclusion that the book is probably best appreciated by Discworld followers.