I had a cat that was maybe 6 or 7 years old when she suddenly started having seizures. After a seizure, she’d be wobbly for a few days, then eventually back to normal… until it happened again. Vet couldn’t figure out what was going on. We decided to try to track when she had the seizures—was it when she ate something out of the ordinary, got exposed to something unusual, on a recurring schedule? That sort of thing. We quickly found out that within a day or two of giving her a dose of Frontline flea treatment (the kind you drip on the back of their neck) she’d have a seizure. We stopped giving her Frontline and she never had another seizure.