"In the final scene, Rooster has found a new horse. Kim Darby's character comments about the new horse. The marshal says that new horse can jump a four-rail fence.
And then with a sweep of his hat, John Wayne jumps his horse across the fence and the film ends with the horse and rider still in the air.
That was Dollor carrying the Duke, said Debra Keffeler of Midlothian, Texas. She's now the proud owner of Dollor.
She said John Wayne first rode the horse in that move when Dollor was just a 2-year-old. The horse then was owned by a California movie production company that furnished horses for John Wayne movies.
"The Duke had an exclusive contract with them that no one could ride Dollor but him," she said. "I think he liked the horse because their temperaments were a lot alike...
...But what he likes best of all is listening to the sounds in one of his old movies. Debra plays the old movies for him.
"He gets all excited when he hears the shooting and that voice," she said. "Then the ears get alert, and he's looking for John Wayne."" Robert Wagner News: March 2005
More info here: Texas Couple Tend John Wayne`s Horse To See That Fans Get Dollor`s Worth - Chicago Tribune