The sequences with the horses were filmed at ranch in Santa Clarita, California, against a large green screen so that the action of the horses could be manipulated in post-production. The total production period  was six days, an extremely aggressive turnaround for a project that was all green screen and visual effects.
At a ranch in Santa Clarita, California, the sequences with horses were filmed against a substantial green screen backdrop to enable editing changes later on. The whole production took just six days, which was unusually quick for a project that relied heavily on green screen and visual effects.