Overheating. Excitability causes overheating and overheating exacerbates a tendency for seizures. I've had two yellows who had this.
Brutus "just" had a tendency to overheat...mostly from external temperatures, though, since Bru was a very mellow boy. He'd also had heartworms/treatment before we got him and that may have been one of the causes. His seizures proceeded from petit mal to grand mal. We honestly didn't know at the time that he was having seizures at first.
Honey was a screwball...very hyperactive and anxious. She developed seizures at the age of 6 and was diagnosed by a holistic vet....hers were from internal overheating. It didn't have to be warm out (started during a very cold winter, after running in the snow). She had three petit mal seizures, each one more pronounced than the one before, within a week or so. We were instructed to change her diet....kibble feeds the fire and food sources have different temperature values so we needed to steer toward cool/warm value foods. [Traditional Chinese Medicine assigns temperature values to foods based on what they do to your body...this is not the temperature of the food as it is being eaten.] Honey's seizures stopped for many years with just this food change (we'd already taken steps to try to contain her hyperexcitability, so that helped, too). She also moderated her exercise level...didn't want to run for as long during a fetch session, for example. When she developed hind end weakness, she was so frightened by her own condition, that her anxiety level caused seizures to start up again. She was 11 at that time.
If you Google Traditional Chinese Medicine food temperature values, you'll come up with some links showing categories of food sources. Again, avoid kibble totally. We used canned but raw/cooked if you're more dedicated to food preparation is good. Here's just one: https://sfraw.wordpress.com/2018/03/...ovel-proteins/
You'll note that two of the most common proteins we use for dogs are hot: chicken and lamb. Not good for a dog with this tendency.
There are others here who've had seizure dogs and followed this...hopefully they'll see this and pitch in.
Note: Our traditional vet was clueless with this but totally on board with what the holistic vet said. If your vet is traditional, your discussion may or may not be all that valuable at this stage of the game. Since your dog's seizures have been few and far between, and clearly associated with activity, your best bet is to attack from the standpoint of food. It can only help.
Good luck!