What do you think it might be? Still vestibular disorder that just hasn't gone away yet?:
I took my 13 year old (almost 14 year old) dog (a border collie) to the vet three and a half weeks ago because she was wobbly, tilting her head, peeing in the house, throwing up, had diarrhea, and her eyes were darting back and forth. The vet diagnosed it as vestibular disorder and said we would see improvement if we gave it some time. We did see a great improvement after about 2 weeks, but she still is walking a bit like she is drunk. She isn't falling over anymore, but she keeps walking with one foot in front of the other and she sometimes stumbles. Besides that, all of the other original symptoms are no longer present. I have noticed her eating more of her food lately and her water bowl has been empty more often (we do have three cats and another dog, so I'm not totally sure she is the one drinking all of it). Sometimes she seems confused and will stand in one place for a little bit before deciding what she wants to do, which is usually lay down. When she lays down she does so slowly, and I suspect that is just arthritis, but I'm not completely sure.
Any ideas are greatly appreciated.