Thank you for your reply, FleeceOnEarth. It happened Friday evening. His foot is still swollen, but the swelling has come down. I'm pretty sure he'll be ok. It'll take time to heal, but looks like nothing serious. Again, thanks for your reply, it helped!
How long ago was it that it happened? It sounds like it is resolving itself, but I understand you don't want to wait if its something serious. I don't think it is, since he let you examine it and is jumping. It being swollen is not an indication of a serious injury by itself, but I would monitor it. I would also keep him in an area where he's more confined and can't jump up so it can heal if you can. If it stays swollen more than a day or so or the swelling gets worse, or he develops any other symptoms, I'd consider taking him to the vet.