I’ve only dealt with it in my own dogs, for hypoglycemia and elevated coccids in young dogs. It’s always good (IME) to carry a can of dog food for ‘pup fuel’ for a hard day of hunting. Even then they didn’t have true ‘seizures’, but blind/dizzy/vertigo type spells. Growing up working for my DVM Uncle, I saw a lot of different ‘seizures’ in patient dogs. I don’t recall there being a single, predominant causality….though I might not recall that, either.