Well I called the vet tonight and told him it can't wait. The swelling has very suddenly moved all the way up into the hock. Vet said he will be out tomorrow first thing... and that he will likely need a serious round of antibiotics. He wouldn't eat his dinner tonight either which is also very alarming. I bought a large jug of the 99% DMSO today, and will be seeking the go ahead from the vet to start applying it (and hopefully instructions on how to put the stuff on correctly!). I also bought 4 new pairs of no bows, since we seem to be going through them faster than I can get them cleaned. Anyway... hopefully a round of antibiotics will get this all under control. I will let ya'll know what I find out tomorrow.