Mattie’s pony, which she buys from Stonehill. Blackie belongs to the group of ponies that Frank Ross bought from Stonehill just before dying, meaning that Mattie effectively sells Blackie back to Stonehill only to purchase him once again when she decides to go on the manhunt with Rooster. Mattie feels strongly for Blackie, who she sees as a loyal animal. When Rooster rescues her from the snake pit, he rides Blackie back toward Fort Smith, but the horse dies of exhaustion before reaching town.