My friend's dog, Koda, gets siezures, but like Josie, not often enough to be on meds. They connected her seizures with eating oily foods, and the vet said that oily foods can start up a siezure, so to stay away from them (I was there one time when she had a seizure. It was a terible, frightening thing to witness. It was just after they had given her a small piece of chicken).

I'll search the net and see if I can find anything that might help you.