Several breeds are prone to seizures. Some authorities believe inbreeding leads to it. I have raised beagles my whole life and have had five that had seizures. I presently have two sisters that do. One has them about every six months and the other about every six weeks. None of the dogs have ever had ill effects from the seizures. No two dog's episodes are the same. Lay then on their side, talk to them calmly, pet them, and keep them down until they have come out of it. I had one that would seizure from the excitement of the hunt. Solved that with a small piece of chocolate prior to hunting. Vet said to medicate if more frequent than six weeks.