Duck has adopted a handsome English bulldog named Winston, but he has no use for the animal

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Question:

Duck has adopted a handsome English bulldog named Winston, but he has no use for the animal and offers to sell Winston to Peggy for $100. Peggy likes Winston, accepts the offer and pays Duck the $100. Unknown to either Duck or Peggy, such animals are extremely valuable, and later Francine notices Winston and appraises him at $5,000. When Duck hears this, he wants to keep Winston. Can he?if yes then why or why not ? Explain