Substitute "brother" for "horse" and you've got yourself one adorable sibling relationship. Except for the whole someone purchasing your brother thing.

Even at thirteen, Albert has more courage than his father. He's willing to enlist in war, the Great War, and risk death to stay with Joey. Do you think he really understands the consequences at that age?

Hey, it's not all about the horses. Captain Nicholls sees something special in Albert. It's probably his devotion to his horse, which would make him a great fit for the cavalry. Although Albert doesn't end up joining the cavalry, he does bring his aptitude for horses to the veterinary unit, becoming a valuable member of the military.