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At a dinner party, Samantha is pestered by Darrin's flirtatious new client, Rex Barker (Jack Warden). When she can stand no more of this unwarranted attention, Sam turns the client into a dog. Sam's problem now is to restore the man to his original human form without revealing to the world that she is a witch, but the outcome of the story is determined by the mortal behavior of Darrin. Written by Jerry Davis, "It Shouldn't Happen to a Dog" first aired on October 1, 1964, in place of the episode originally slated for that evening, "Mother, Meet What's His Name."