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It's been awhile, but from what I can recall, he was originally going to be tasked with working on the movie then known as American Dog, but now known as Bolt. He was getting fed up with the higher ups modifying and changing the story because a lot of Chris Sanders's original themes were more adult than Disney wanted for a movie that was to be made for Children. IIRC Chris Sanders cursed out the executives and walked out, but later came back and negotiated an exit contract. But it's been years, and I could be mistaken on the exact events.