Our wonderful mutt suddenly got some sort of seizure disorder when she was 11 or so while we were on vacation in Cape Cod. She seized twice in the space of a few hours. The first one lasted only 10-20 seconds (which seemed like a lot at the time) including incontinence. She was a little disoriented afterward, but seemed fine after 15 minutes or so. A few hours later, however, she had another seizure the initial phase of which lasted for several minutes – involuntary leg motions, complete nonresponsiveness, foaming at the mouth. Then she got up and started walking around stiffly and apparently aimlessly, but generally in an expanding spiral, still completely nonresponsive to having her name called or being touched. This eventually took her outside the house where we were, and she wound up crawling under the house (something she had never done before in a decade of going there) and going to sleep for hours.
I was sure she was dead. I was sitting by the place she had gotten under the house from – I couldn’t have made it to where she was, the space was too tight – sobbing. Finally, I could make out that she was, in fact, breathing. I sat there until she finally crawled out again, then took her to the vet. (I had spent a good deal of the waiting time on the phone with vets, or doing online research.)
The vet thought she had some sort of tick-borne illness. She prescribed a bunch of drugs, including antibiotics, tramidol, and steroids. (The steroids made her pee in the house plenty.) The dog had one more brief seizure a few days later, after which we led her to a dark bedroom to recover.
She lived another three years, and as far as we know she was seizure-free, without any specific medication. She aged a lot instantly, however, and was never as athletic again as she had been. Also, she was constantly molting, losing a full coat and replacing it every few months.
One day I came home from work early, to find her in the middle of a huge seizure, alive and eyes open but completely unresponsive in a pile of her own feces, in a place she would never have chosen to lie. She was occasionally jerking her legs. I waited for 20 minutes and there was no change in her condition. I wrapped her in a blanket and brought her to the vet ER. She never regained consciousness as far as I could tell. When the vet saw her, he asked if she was alive, then he said, “You can’t possibly want me to try to revive this dog.”