It was a nice little book. I searched one of my cats belly button after I read it, but I couldn't find it, with all the hairs she's got. I didn't try my second cat, because she bites and scratches whenever you someone touch her belly (I found my dog's belly button, though).
Some questions were funny, some were interesting and some weren't. But it is well written, easily read and can provide the reader with interesting data.