When Cale and Ben go to Ashford Stud to check out the studs , the stallions they are naming , such as Fusaichi Pegasus , Giant 's Causeway who is also the real son of the horse this movie is based upon , Mariah 's Storm , Johannesburg and Grand Slam , are real horses who actually stand at Ashford .
The film Dreamer is based upon the story of real-life horse Mariah 's Storm .