Hopefully he'll be fine then... How does the law read in your state? Could you get out of getting a rabies shot? I know in WI I can have a vet provide a waiver saying the dog has a reaction to the last one and shouldn't get the vaccine again...
I would probably still have the initial shot though. I'd hate for Oscar to get bitten and then have something happen to him because he didn't get the rabies vaccination! I don't think there's any way to tell if he's going to react to it or not until he actually gets it...
Check out
DogAdverseReactions.com They have a page on vaccines with all kinds of information and articles to read through.