Answer:
Rainsford won the wager. He fought Rainsford in the bedroom and Zaroff got fed to his own dogs. I suppose when Rainsford is in a tree and reflects that this is how an animal must feel to be hunted tips us off that he has a new attitude. The story, however, is so bizarre that the theme isn't dealt with in any depth. Perhaps Rainsford might think a little more about hunting defenseless animals in the future but I doubt he would start an animal rights movement.
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