any idea what the product was?

No, but both owners immediately took their dogs off the oral application and switched to a topical, no more seizures for either dog.

Well, since we don't know what that product was, not much help. There are several oral flea products on the market. I have been a practicing vet for over 26 years though and yet to see any of them cause seizures in any breed of dog. Some are a lot less effective than others is the primary difference I see between these products.

mazer, thanks for the heads-up and reminder that I need to frontline Lucy.

It was a flea AND tick product...not just flea

The site I will link below has interesting information about many different flea & tick products for dogs.

I have heard that both imidacloprid and spinosad can cause seizures in some dogs (we use oral spinosad with no ill effects so far).

Here is a link that might be useful: Ingredients list