My Brother Talks to Horses (1947)

Director: Fred Zinnemann
Cast: Beverly Tyler, Charles Ruggles, Edward Arnold, Ernest Whitman, Jackie 'Butch' Jenkins, Lillian Yarbo, Peter Lawford, Spring Byington

Synopsis:

Living with his family in Baltimore, 9-year-old Lewie Penrose claims that he can converse with horses–and also pick the winners of upcoming races. When it appears as though Lewie is telling the truth, he attracts the interest of gambler Rich Roeder who needs a “sure thing” in the upcoming Preakness. Meanwhile, Lewie’s older brother John carries on a romance with the lovely Martha.