Sorry to hear about Max. Did they check her thyroid? I would think if the MRI didn't show a tumor you would be left with environmental or some other under lying issue, tick borne illness or reaction to vaccines flea treatments the list is endless. Idiopathic Epilepsy usually starts early. Kiya was 18 months old when she was diagnosed with idiopathic epilepsy she will be 10 in May on meds since she started having seizures. I once thought stress was her trigger till she proved me wrong.
Canine Epilepsy Resources
this is a great support group also on FB