We saw it (again) about 2 years ago I think? It was at the community theater, and I couldn't remember either. Our DD is unusually insensitive to scary stuff on TV. I mean, we're not showing her the X Files or anything, but sometimes I'm surprised (not proud of, just surprised) at what she's ok watching, and she never has nightmares. She did fine.
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I think it might be scary for most 4 year olds, though. There is a scary wolf. There is a really sad scene where Atreyu's horse dies. There's storms. I think that covers it, the rest is just good old action/adventure. You'd have to decide, I think if your kid CAN be scared of a movie, this one might be a bit scary. I think it's aimed toward 7 or 8 year olds.