The Boy Who Cried Werewolf (1973)
Little Richie Bridgestone goes to spend the weekend with his father at his secluded mountain cabin, and witnesses his father being attacked by 'a creature' that the boy recognizes as a werewolf. He tries to convince his mother and his therapist that his father is now a werewolf.
Directed by: Nathan H. Juran
Starring: Kerwin Mathews, Elaine Devry, Scott Sealey, Robert J. Wilke, David Cass Jr., Bob Homel
Links: IMDb, Movie posters, Movie stills