If you're a fan of the book 'My Friend Flicka' or the original 1943 movie of the same name, you are going to be severely disappointed with 'Flicka'.
This isn't the story of a young boy daydreaming about owning his own horse, and when his dad allows it he chooses one thought to be too crazy to tame, a boy who learns about love and responsibility. It's the story of a teenage girl who daydreams about owning her own horse, goes out on her own to catch a wild mustang, and tries to train it behind her father's back. Her father sells it when she gets hurt, then she turns around and steals it from the rodeo. The moral of this heartwarming tale is that if you disregard your parents often enough, they'll eventually cave in and see that you're right.
So basically, nothing to do with the original Flicka at all.
Good old Gus is reduced to an extra with a few lines (like passing on that 'Flicka' is Swedish for 'little girl) instead of a caring and involved farmhand who disobeys his boss because of a little boy's love. Flicka becomes a mustang, not part of the family's herd, and Katie (instead of Ken) is not allowed to have her own horse as her father is stiff, strict, and - let's face it - sexist. And the cougar takes a more sinister and active role.
The worst thing about this movie is what it teaches young kids about horses. The things that Katie does in the film are unrealistic and downright dangerous, and the father is absolutely right in trying to stop her (though if he had have taught her how to train the horse as he did in the original, things would have turned out differently, but then society these days requires more action).
This movie is the typical childhood Black Stallion fantasy, to the point where they even made Flicka BLACK instead of sorrel. It wouldn't have been as bad if they did not try to use the name of a much loved classic novel to promote their film. Were this a stand alone story, it would have been far more acceptable, but to claim that this film was based on the novel is a joke.
That being said, it was beautifully filmed and Tim McGraw did a much better job acting than I expected.
Bottom line - your kids will love it, but if you're a fan of the original or know ANYTHING at all about horses, this movie isn't for you.