Sit. Stay. Be Polite with Strangers. What could be easier? That's what Doodle thinks when Molly signs him up to take the Canine Good Citizen Test at the annual DogDays Fair. Compared to the certifications he has to pass for his job as a bed-bug sniffer dog for the "boss," Molly's father, this should be simple. But the test turns out to be no walk (or sit) in the park. Did he miss the memo about the explosions? And the stolen pets? While Molly and...