We had a GSD who was diagnosed with seizures at 2 years. When we finally found the right levels of medications for her, she was seizure free until the passed away at 8 years (not due to the seizures).
They can have breakthrough seizures even when on meds but the vet always told me unless it was cyclical or there were 2 very close episodes then it wasn't something to panic about.
She was still very active and beautiful natured to the end
Hope all your dogs do well :rolleyes: