I have a boxer who has occasional siezures. I have finally recognized the warning signs - a day or so before it happens, he becomes very clingy to us and will start salivating a lot. Sure enough, he'll have one shortly thereafter. Our vet said if we are able to distract him, like call his name and he'll turn his head, then his aren't anything to worry about. Fortunately, he will acknowledge that we have called his name, even had him come to one of us, so that's good. He's not on any medication either. The episodes last anywhere from 1-3 minutes and then he seems to be pretty tired for awhile. After that, he's fine.
Good luck with yours, hope all goes well for you.