u/BumblebeeNo504

Its my parents dog and I mean in terms of balance, reaction, awareness, energy and appetite. She was showing age but suddenly got so much worse starting about a month ago. A lot of the time doesnt appear to have any idea where the hell she is now, stares and gets trapped in corners or against the wall, falls over very easily and has lack of balance, doesnt instantly go when taken outside anymore, is very confused, barely eating. Two nights ago she did the nightmare type light shaking for a few hours on and off and made little noise but i dont think she was sleeping or fully asleep. I dont believe it was a seizure of any kind due to having a different dog who had them and it looks nothing like it. She has no history of seizures. Has not eaten anything weird anywhere to cause this. Some parts of some days shes like the version from before she got worse. She has had yellow discharge on and off for a while, but i think this is from her not lifting her butt of the ground when peeing and getting dirt in her vulva. She does not appear to be in any pain but is like a baby deer who cant stand or walk right yet. Tons of discoordination and muscle weakness. :( is this Vestibular Disease? Could it be something else too? What do we do?