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While stopping over at a commerce planet, Moya and her crew pick up a dangerous parasite. Chiana (Gigi Edgley) purchases a small and supposedly benign creature called a Vorc to track down and eliminate the unwelcome "visitor." But the Vorc turns out to be of a deadlier breed than expected -- and still worse, D'Argo (Anthony Simcoe) has been poisoned by the bite of a still-unidentified hideous beast. "Beware of Dog" was originally broadcast on August 11, 2000.