Review from goodreads:
Erik is preparing for his first-ever hunting trip when he learns that his parents are being deployed to Iraq. A few days later, Erik is shipped off to North Dakota to live with Big Darrell and Oma, grandparents he barely knows. When Erik rescues a dog that’s been stuck by a porcupine, Big Darrell says Erik can’t keep him. But Erik has already named her Quill and can’t bear to give her up. He decides to run away, taking the dog and a shotgun, certain that they can make it on their own out on the prairie.