My Friend Flicka - "Blind Faith" (1955)
Flicka has a nasty fall after being spooked by a hunter's errant shot which results in a serious head wound and blindness. Ken's parents want to put Flicka down, but Ken desperately requests assistance from a famous veterinarian to restore his horse's sight.
https://www.imdb.com/title/tt0654591/plotsummary…
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