I know absolutely NOTHING about dogs with vestibular disease, but I can tell you about HUMANS and vestibular disease (BPPV) Benign paroxysmal positional vertigo.
I have it and when I get an episode, everything inside of my head spins. I can't focus my eyes on anything, the whole world spins (think a really bad drunk), in order to walk, I have to hold onto a wall or use a cane. I puke a LOT! I also have diarrhea.
The valium that the doc prescribed for the dog is also prescribed for me. It relaxes to vestibular nerve within the ear. I also take meclizine, much stronger, but the same as dramamine.
I also go to physical therapy, Brandt-Daroff exercises and the Epley maneuver. (Look these up on youtube). My episodes last anywhere from one week to eight weeks (the longest).
I have never had anything put me down for such a long time, but I am learning to not aggravate the condition by slowly getting up, turning around and NEVER leaning over, face first. If I do, I usually face PLANT!!!
I don't know if any of these will help an animal, but it might be worth a try.
