Whether this movie scares your kids or not may depend whether they know the book. My 6-year-old son has read the book many times, so he had the confidence that he knew what was going to happen & Mr. Fox and all the other "good guys" would survive. Admittedly, it departs tremendously from the book, but the ending is untouched.
My son liked this movie as much as he liked the book. I, on the other hand, found the movie tedious, with long sections of pop-psychology babble about why Mr. Fox is motivated to steal chickens, yadda yadda yadda. In the book, there is no such soul-searching. Mr. Fox steals chickens because he is a *fox.* The movie also shoehorns in lots of pop psychology about the Foxes' marriage & the rivalry between 2 adolescent foxes. Now, I can like talky movies with lots of character' development, but this just hit me as a load of cliches and stale jokes. I was really surprised my son liked it. Maybe he liked it *because* all the poorly-done psychobabble went over his head. He said he liked it because there were good guys and bad guys and the good guy was smart. Well, I guess that's as close as it gets to a good message: smart is better than dumb. Otherwise, I found this a big waste of time.