With his older brother gone to fight in the Great War, and his father prone to sudden rages, 14-year-old Stanley devotes himself to taking care of the family's greyhound and puppies. Until the morning Stanley wakes to find the puppies gone. Determined to find his brother, Stanley runs away to join an increasingly desperate army. Assigned to the experimental War Dog School, Stanley is given a problematic Great Dane named Bones to train. Against all odds, the pair excels, and Stanley is sent to France. But the war in France is larger and more brutal than Stanley ever imagined. How can one young boy survive and find his brother with only a dog to help?