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Sometimes even doctors can't avoid illness. We check back in on the clinic, suffering from the flu. Dr. Pol and his staff must fight through it to help the animals that depend on them. It's easy for Dr. Pol to describe what's wrong with himself, but not so easy for his mooing, barking, bleating and meowing patients. He heads out to a dairy farm to check on a cow with digestive problems. It turns out it has swallowed some metal objects while grazing.