Hello, I'm Dr. Deb and will do my best to help you today.
I'm sorry that Gidget has been having seizures.
As to the underlying cause for them in a dog this age, the most common reason will be Idiopathic...which means that we can't find an underlying cause for them! As frustrating as this can be, it's very similar to humans with epilepsy such that there's abnormal electrical activity in the brain which triggers them but we don't know why.
Diet has been implicated in some canine patients as an underlying cause although it's not a commonly seen one. But, changing the diet may be something to consider.
Other possible causes would be liver issues or a brain mass (usually in older dogs).
If Gidget is having seizures this frequently, then if she were my patient, I'd recommend starting her on anti-seizure medication such as Phenobarbitol or Potassium Bromide. These medications can reduce the frequency and often the severity for most patients although seizures may not 100% controlled in all patients.
If she's currently taking anti-seizure medication and she's still having seizures this frequently, then her medication may need to be adjusted. I typically recommend that blood levels be done prior to any increase in the dosage to avoid toxicity issues.
I also recommend the following which may also help to reduce the frequency:
1. Magnesium oxide (not citrate or chloride) at a dose of 200mg/day. Some forms may cause diarrhea; just reduce the dose should this happen.
2. Taurine at a dose of 500 mg- 1 gm.day
3. Melatonin at a dose of 1-5mg at night Just be sure to double check the label and avoid those with Xylitol in them which can be toxic to dogs even in small amounts.
4. Vitamin B6. Purchase B -50 multiple B-vitamins and give 1/2 day
5. Medium chain triglycerides (unprocessed coconut oil) 1 tsp/day but it should be the unprocessed type
6. Vitamin E 200 IU/day
7.Omega 3 fatty acids. Welactin in a good brand which includes the dosage amount on the label.
8. SAMe (S-adenosyl-methioine) manufactured by Virbac aka Novifit which als oincludes dosage amounts on the label.
I hope this helps. Deb