Does anyone know about dog seizures?

Our littlest Beagle, Gypsie had what had to be a Grand Mal seizure yesterday.. its the firs tone I've witnessed, but she's had 4 now this year.. it was terrifying to me.. I've never seen anything live look and act like that.. stiff as a board, eyes bulging out, foaming from her mouth.. She has an appt Thursday, but I don't know what to do to help her.. I can't lose Gypsie - she's my little girl...

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