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Amelia and Sam's drama teacher brings her puppy to the Ark veterinary hospital with a plaster cast on his leg. Veterinarians remove the cast, but Oscar does not stand on his leg. It turns out that he needs a long rehabilitation. Miss Sachs is running out of time, because the school is preparing for the performance of The Wizard of Oz, in which Amelia has been cast as the lead. Will she have enough time to find a way to help the tiny terrier?