<p>Lucky is a golden-haired mutt with a nose for survival. He has always been a Lone Dog, relying on his instincts to get by. Other dogs have Packs, but Lucky stands alone.</p> <p>Then the Big Growl strikes. Suddenly, the ground is split wide open. The Trap House is destroyed. And all the longpaws have disappeared.</p> <p>Now Lucky is trapped in a strange and desolate new world with no food, foul water, and enemies at every turn. He falls in with others left behind, including his littermate Bella, a Leashed Dog. Relying on other dogs - and having them depend on him - brings new dangers that Lucky isn't prepared for, but he may not be able to survive on his own. Can Lucky ever be a true Pack Dog?</p>