I'll chime in on the full vet work up and the seizure diary too. Our first Basenji had seizures his entire life - his first was at 6 weeks old. He lived to be 16 years old and was never on medication for the seizures. In fact, our vet told us, "The meds are actually more for the owner than the dog. They don't truly 'stop' the seizures. But the owner feels better." And the side effects of most of the commonly prescribed anti seizure meds can be pretty bad, especially if the dog is on them for a long time.
Terry