Rafiki
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There was a show on TV (wish I could remember the name) recently about a cheetah in a small US zoo that appears to have been born with the same thing. Also abandoned by his mother. He was to undergo some sort of fusion surgery at around 6 or 9 months but when they went in, his had resolved itself. I agree with the others - surgery while he is young is his best bet. Good luck and please keep us posted.