I had a Lab female who, out of the blue, started having seizures at about 3 years old.
Someone on the RTF site also had the same problem & was considering Phen.Barb.
They were advised to change their dogs food. I did immediately & saw changes right away.
I bought the healthiest food I could find. They went away completely over time.
The food I was using is one of the most popular brands around.