So your debut memoir was a huge sleeper hit because it had an adowwable labrador retriever on the cover. But what do you do for a follow up? It's not like you can go out and get another pet that will misbehave, unite your family, and then [SPOILER!] die in tearjerking fashion. Well, if you're savvy businessman-author John Grogan, you find ways to extend your brand without ever coming up with any new ideas.