I had almost the exact same situation a few years ago with my older dog. She was dying of lymphoma, had already had a few seizures and was clearly not her old self at all. We had her on various steroids and each one seemed to make her feel so much better that I kept feeling like she was improving. Then, as she got used to the meds, she's start to degrade again.

Her last seizure happened when I was there about to leave for work. I freaked out, rushed her to the vet and they told me that it was the beginning of the end but that she was in no pain and was not uncomfortable. They also told me that she was completely unaware of having had a seizure which was good since I totally freaked out on her as it was happening.

I knew we were leaving the following weekend for a 4 day camping trip. I arranged for her to be boarded at the vet, but even then, they aren't with them 24-7. I just couldn't accept the possibility that she could die alone in an unfamiliar cage. We had her put down a couple of days before we were schedules to leave (one day after that last seizure).

To this day, I question my decision. Even as I type this, I can't help but think that I should have cancelled the trip to stay home with her. But at the time, we just knew she was on her way and I kept trying to think of if as letting her go. Had I not been pumping her full of steroids, she probably would already have been gone. Before we started the first round, she could not even stand to go outside - we had to carry her. This was no minor problem and yet, I still question our decision and my motives.