Did the pup ever have a respiratory infection? That usually precedes any neurologic signs by several weeks. Its proabably been twenty years since I have seen a dog with post-distemper encephalitis--most of them have pronounced and continual jerking motions with their feet and jaws. (These were sometimes called "chewing gum fits")
Since the disease is so rare now, and there are so many other possible causes of neurologic problems, I would vaccinate.
I would be more concerned about hydrocephalus, liver shunts, or something similar at this age. Has the puppy had blood run for distemper antibody titers?
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