IF it is this neurological disorder this is a good pdf document you may want to save and print off:
http://www.cvm.umn.edu/academics/Cur...0the%20Dog.pdf
Also, if your vet thinks that this is what it may be it's all the more reason for him to be in a 24hr facility as this condition can rapidly change and deteriorate to the point of the dog needing to be on respirator.
Seems like Rabies vaccine can be culpret as well as raccoon saliva. But to be honest I can't see how your dog could come in contact with raccoon saliva, stool yes but saliva?
Did the vet check your dog for tick bites and ticks in the skin?
Then there is botulism poisoning. Did he get into any spoiled food?