Thicker Than Water
by Sydney a HorseCrazyGirl!
When Natalie Jones' (played by actress Melissa Gilbert from Little House on the Prairie) father dies, she learns about a hidden family secret and heads off to a horse ranch to investigate.
This is a good horse story, great scenery and beautiful horses. It doesn't go so much into any one particular horse's story, but it does have riding and involves rescuing wild horses.
I don't want to give too much away, but if you are looking for a movie to rent and watch, I would recommend this.