Had a akita that we had pts last year who suffered from fits legs went stiff and she fell to the floor shaking and making a strange sort of noise, the vet seemed to think it was epilepsy but wasn't worth treating as the fits were too infrequent, only happened in hot weather though, the vet also reccomended to give her something cool like a ice lolly {not much good in the field} to help her core temp and sugar levels and the best thing for recovery was a darkened room, hope every thing goes well with you dog mate.