The Black Stallion is a 1979 American film based on the 1941 classic children's novel The Black Stallion by Walter Farley. It tells the story of Alec Ramsay, who is shipwrecked on a deserted island with a wild Arabian stallion whom he befriends. After being rescued, they are set on entering a race challenging two champion horses. Wikipedia
Veterinarian: This horse has got a leg like iron; he's gonna be all right, son.
Alec Ramsey: Henry!