How often and how long does it happen? The only reason I ask is that my boxer does that too. I've only had her since March and she's only done it twice since I've had her and they don't last long. I've had one vet, the one where she was kenneled before I got her, tell me that it was more than likely a seizure. People have different kinds, so I guess dogs can too, cause my GSD had epilepsy and you definitely knew when he was having one. You wouldn't know it with Daphne unless you were looking at her when it happens. Has your vet done other tests on her first or did you take her to a neurologist first? My mom's dog had a stroke (shaking, eyes rolling, and other things) but her vet said that sometimes some kind of inner ear infection/disease presents itself with those type of symptoms. Sorry I can't remember the specifics, it's late and I'm rambling!! Good luck with everything and I'd be interested in what you find out! Too cute by the way!