From Wikipedia, the free encyclopedia Dorothy Short (1915 - 1963) was an American film actress mainly in low-budget westerns and serials in the 1930s and 1940s. A native of Philadelphia, she married actor Dave O'Brien in 1936, the same year they appeared together in the low-budget exploitation cheapie Reefer Madness, which in modern times has become a well-known cult film. She also appeared in another anti-marijuana film Assassin of Youth in 1937. She often appeared alongside her husband in various 'B' pictures and the Pete Smith series of …