my great dane had fits when he was about 1 year old,all test revealed nothing, after 2 weeks of the fits getting worse and more frequent,upto 3 a day,Put him on some epilepsy drugs and the vet said it wont stop the fits will only make them less severe and less frequent.started on max dosage and he had no fits ,over the course of around 12 months reducing dosage he had no more so i took him off altogether.vet was a bit apprehensive and gave us some steroid type cream to shove up his bum if he had a fit and wasnt coming around. He has’nt had a fit since going on the drugs or coming off them (fingers crossed). His sight however is not very good after a big seizure the day before he went on the drugs. reason i wanted him off the drugs was he was very lethargic and was’nt his normal self.