I had a miniature poodle who had seizures. They started abruptly and the first one occurred in my daughter's bed while they were sleeping together. Ashley (my poodle) started seizing and foaming at the mouth and her bladder emptied on the bed. Her seizures were closer together than your dog's. She had a seizure two nights in a row and we knew it was time to call the vet. He started her on Phenobarb, two pills a day. I gave her the morning one and hubby gave her the evening one. She never had another one, although we had to go periodically to have blood tests to check on the levels of the drug in her blood. She led a completely normal life and actually got into the routine of coming to us for her pills at the two specified times of the day and was a real sweetheart about it. She lived to be 14. Please let us know what you find out. By the way, the pills were very inexpensive but that has been quite some time ago.