Based on Poole’s behavior in The Strange Case of Dr. Jekyll and Mr. Hyde, readers can infer that he

Poole has served Dr. Jekyll faithfully for many years. When he becomes alarmed by the strange events in Jekyll’s house, he seeks Mr. Utterson’s help because he is concerned for his master, not because he is working for Utterson. This shows that Poole is a loyal servant to Dr. Jekyll.

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