The film is based on a true story. While she was living in Hollywood with her husband, writer Romain Gary, actress Jean Seberg brought home a large white dog she had found on the street that seemed friendly and playful. However, when the animal saw her black gardener it attacked him viciously, injuring him. Afterwards they kept it in the back yard, but one day it got out and attacked another black man on the street but no one else. After this happened a third time they realized that someone had trained the dog to attack and injure only black people. Gary wrote a story about it, and eventually Samuel Fuller read it and made it into this movie.
Never released theatrically in the United States, supposedly out of concern for its controversial subject matter. It did air on HBO several times.