Jillian was diagnosed with Epilepsy after 2 grand mal seizures in less than 11 hours, her trigger is heat and a month before the seizures started she had a dangerous fever that required a 4 day hospitilzation. they basicly diagnose it by testing for everything, and when all is fine - its epilepsy. I'm not saying your dog DOES have epil. but its one of many a possibility that should be looked into