After brief modeling and radio experience, Dow was spotted by a talent agent and cast in a television show in February 1949. Shortly after that exposure, Universal offered her a seven-year contract. Dow made nine films, most notably as Nurse Kelly in Harvey (1950), starring James Stewart, and co-starring with Best Actor Oscar nominee Arthur Kennedy in Bright Victory (1951). After being featured in several crime dramas, Dow had starring roles in two 1951 family films, Reunion in Reno and You Never Can Tell.

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