Your pet’s medical professional will be able to look more closely at the symptoms of peripheral vestibular disease in dogs, provide her opinion about the vestibular problem, and determine if its cause can be readily identified. She can also provide medicine to help support your dog. For dizziness (and resulting nausea and vomiting), Meclizine is a widely.prescribed,standard treatment. A newer drug, Cerenia(maropitant citrate) available as an injection (and used with success by Dr. Sebourn on many pet patients), could be an even swifter support. And your vet can prescribe or recommend over-the-counter medication to help reduce your dog’s diarrhea, if that is an issue.