I have very little experience with it. But my Aussie, Zoee, has had what we believe to be seizures. Luckily hers are spread very far apart and so far are petit-mal. This past Easter morning was the most recent episode, and she had a couple that day. But my vet said since it's not happening more frequently there is not much to do at this time. She gave me some doggie valium for when she does have them. If they do become more often Phenobarb would be our next step.
Here is my thread I had about Zoee. Seizures The part about her seizure starts on post #11. Denyce suggests to try changing food, that worked for her.

Were these three seizures the only ones he has ever had? And what level are they? Can you describe what happens to him?
I'm asking these questions, because I'm thinking if it was the one and only time he may not need to go on the Phenobarb. But that also depends on the severity of the seizures.