Lost my dog right on a year ago to 'idiopathic seizures.' Around Christmas, he had a couple of incidents where he's get overexcited for his treat and kind of just fall over from a crouch, a couple weeks later he was falling over and wetting himself once or twice a week. Didn't make it to the end of January. He was 12 yo and the vets had nothing for him, it was just something that happened to some dogs.
If I had to pick a spirit animal, I'd have to go with doggy.