Doodle’s repeated pleas of “Don’t leave me” foreshadow the later events in the story where the narrator, in moments of frustration and pride, ultimately distances himself from Doodle. The most fitting option that aligns with this foreshadowing is:
Later in the story, the narrator races ahead and leaves Doodle to struggle behind during a terrible storm.
This event highlights the narrator's growing impatience and desire to distance himself from Doodle, which ties back to Doodle's fear of abandonment expressed in this excerpt.