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Did he take a fall? If he didn't a swollen limb is a sign of MBD. Hope everything alright with him/her..
It's hard to say without knowing what is causing the swelling. Photos would be a good start but if it's an injury like a strain or whatnot that didn't leave a bruise it'll be difficult to say. Would there be a reason to suspect gout, in your gutloading or something?