Just two days ago, my hyperactive minischnauzer transformed into this strange dog I don't know (and seems like she doesn't know me---our 8-9 year friendship does not seem to register with her anymore, she doesn't seem to have any particular affection for me).
Symptoms:
-sits awkwardly for hours on end looking at things like the floor in front of her or a blank wall 2 feet in front of her
-she acts nervous/timid/scared, especially around me in close quarters and in our house (in the car from the vet, she was fine but when we got home didn't want to get out---also just took her on a walk, and she was almost normal until we got home).
-won't eat/drink anything (even favorites like chicken, milk, etc)
-is in physical pain; vet could not diagnose where it was originating from
History:
The night before this all happened, my dog vomited in our bed. There wasn't much vomit left when I woke up and first realized she vomited, so I guess she may have re-eaten that vomit. The next day, my dog had a rectal temperature of 103, which I understand is slightly above normal for a 15lb dog. The morning after she had diahreaa (but this might have been because at this point I was forcefeeding her chicken which doesn't always sit well with her stomach). I took her to the vet later on this day. The vet treated her for acute gastrinal intestine bacterial infection, but nothing on the weird behavior.
Shots in the Dark Possibilities:
-Prior to this, my dog was scared of our propane fireplace (the fumes themselves make her hide in a backroom). Our furnace has been out, so I have been using the fireplace and an electric wall heater to keep warm. I haven't used it today however, and my dog is still as odd as ever.
-2 days ago, I let my dog out in the backyard late at night. My sick dog seemed to chase something, but I don't think she caught it. Looking around in the yard today, in that same area I see some kind of animal hole.