In contrast to the domesticated White Dog, the wild mustangs running across the plain represent utter freedom. Looking out the window, the boy admires and longs for this ideal state of wild independence. The use of the pronoun “they” in “They are going away” also allows for the boy to link the horses to the family, even to all the Japanese Americans. The family, like the horses, are going away, but instead of running to freedom, the train hurdles toward internment.