Man's Best Friend (S02E34)

Darrin plans a celebration because Samantha hasn't used witchcraft for almost a month. Then Rodney, a neurotic warlock, appears. Expressing his love for Samantha, he demands that she run away with him. Samantha, after trying unsuccessfully to convince Rodney that she loves Darrin, forces him to leave. Darrin arrives home with a shaggy brown dog. Samantha discovers the dog is really Rodney. Samantha's statement that her marriage is based on mutual trust inspires Rodney with a plan to break up the Stephens marriage. (iTunes)