That doesn't really sound like a seizure... I have a seizure dog too and the ones Sadie had sound a lot like Xena's. But the ones your boy is having just sound like when my dogs lick something weird and kind of barely chomp their jaws a bit. Maybe TMI but Eko is not neutered so he has gone and licked the ground where Xena has peed and then done that. Or after he licked a piece of candy, etc. All dogs I have had did this.
Mr. Eko 2/14/2012 - My first GSD and my little Romeo
Xena 11/30/12 - My first APBT and my little warrior princess