I'm about to take my 9 year old jack russell/spaniel mix to the vet. She has a quarter sized lump/sore at the spot where her rabvac vaccination was administered. I know some time has passed since you posted your warning, but I just came across it doing research. What became of your case?
I wish I had done some research regarding vaccinations before I took her in for hers, but she's had no issues with them before.