According to the vet, they haven't seen any cases of problems with Advantage in dogs. They have had two cases of young dogs with epilepsy however. Both are over a year old and they are controlled with medication.
From what I have read about Epilepsy, it is very treatable. This is the route that the vet wants to take at this time. They did suggest trying to wean her off of it after a period of time to see the reaction. If it is epilepsy, the seizures will more than likely return. If not, then we will know that it is a reaction to something.
I will not be giving her any more Advantage. Our other dog of 14 years had the heartworm medication without the medication for fleas and ticks and she never had either. She was a house dog also.
Thanks for all of your help