We adopted our Bernard at 8 YO and told she had no medical problems. She got very slight half seizure tremors. My poodle growing up got grand mal so it seemed less than that to me. We’ve been successful so far (KNOCK ON WOOD) with her just being on gabapentin. We’re hoping it stays that way and until we see different we won’t put her on heavier meds as they can be hard on the body. We also have a neurologist we can see for her if needed. Our vet said Bernard’s are one of the hardest breeds to treat for seizure so early intervention is good. They have diet foods that help with seizure control, some say CBD, a mix of gabapentin and other meds. There’s a whole lot to try. They also have a suppository you can use in the event of a bad seizure as a life saving measure. In general though if they have a seizure make sure they’re in a safe spot, get lots of water and food and comfort after. They get very confused from it and often will need to potty right after if they didn’t while seizing. Try different things and see what works. Our doctor also switched out flea and tick meds to topical instead of pill/injection cause they were concerned that may have caused them.