The yellow Lab I had (before I got Barley my 9 year old Cocker) had fits all throughout her life - the first one happened when I was out walking her and miles from anywhere ... thankfully she recovered fairly quickly and I didn't have to carry her home as I had feared! Tests revealed nothing specific, and she only fitted perhaps once or twice a year, so we didn't have her put on any medication. She would telegraph the signs if I was careful enough to watch out - she needed space to get through the seizure, and was a bit groggy afterwards, and sometimes sick, but was back to normal pretty quickly, and all our friends and my workmates soon got used to her occasional 'do' and we all rallied round and helped her feel better afterwards. Nothing else about her was affected - she was very placid and well behaved but would rag about like a pup if we were feeling like larking around - playful but careful of the children, and lived until 12-13 years before her joints betrayed her and she could no longer get around and sadly went to the Happy Hunting Ground!
We had a dog handed over to us at the Blue Cross who had had a history of seizures which had been getting progressively worse and his care was actually wrecking the marriage of his owners. His seizures would begin and he would have perhaps three, four or five in a day, which left him (and them) exhausted, and he was becoming awkward in his movements and his sight was deteriorating. We tried our very best to stablise him, since they had been overdosing his medication in an effort to stop his seizures (!) but sadly he went into a series of progressively worse fits from which he never recovered.
There are lots of sites and lots of information about epilepsy, but basically it is a short-circuit in the brain, and if it is interfering with the dog's quality of life, then you need to give some thought as to what is the best course of action - if it is only one seizure every so often (and my Poppy never fitted whilst swimming etc - I think they know well in advance ..) then I think you can live with it because it is no big deal. Other dogs with differing levels of affliction respond varyingly to the medications available, so never give up!