Dog Gone by Rob Biddulph

In a funny role-reversal, a cute pug called Edward Pugglesworth (Teddy for short) has a pet human called Dave whom he takes out for walks each day. In the park where they walk lives a fabled furry-faced troll. One day, Teddy loses sight of Dave and finds himself face to face with the green-eyed monster and his scary eating machine… What will become of Teddy now? And will Dave, the yellow-jacket-wearing human, ever be found?!