We had a yellow lab that would have seizures. My husband had been instructed from our vet how to inject Ranger with a medication which really helped...when we knew about them. Problem was, of course, that we had no idea how often he might have seized while we were at work.
We figured out that most of Ranger's seizures happened when a strong low pressure system was moving through...I don't know if that would be a scientific fact, but with us, watching the weather helped with keeping Ranger from seizing.