Final answer:
Sentence 4 is foreshadowing that Doodle is no longer present in the narrator's life.
Step-by-step explanation:
The sentence from the excerpt that is foreshadowing is sentence 4 because it implies that Doodle is no longer present in the narrator's life. The mention of the grindstone turning and the narrator remembering Doodle suggests that Doodle may have passed away. This foreshadows a tragic event involving Doodle, setting the tone for the story.
Learn more about foreshadowing in literature