This setting affects the plot of the story because: Pax learns to hunt for food in the wild when Groy is unable to hunt for them both.
One vital feature of this story is the setting which was predominantly the wild. After Peter left Pax the Fox in the wild, Pax was taken under the wings of Gray who had experienced living with humans.
After Gray is injured during the mine explosion, Pax had to learn how to hunt for them both. So, he learned how to be independent in the wild.
He adjusted with the other foxes that when Peter reunited with him, there was actually no need to take him along because he had adjusted well to the wild.
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