Canine, Saint Bernard mix, 4 years old and 97 lbs
Has had no major issues in the past beyond a few foreign object ingestions (pizza dough etc) and some seasonal allergies
Currently on simparica trio and had a cytopoint injection 2 months ago
Woke up this morning 5am and couldn't stand up, was leaning to one side or the other. Nystagmus in right eye.
Took him to e-vet and they stated he was stable, and he started trying to walk right when we got him home. He was 90% normal within 2 hours.
Location: PNW
Our last dog at 13.5 had a series of somewhat similar vestibular episodes which ultimately were revealed to be a brain tumor or meningitis (we declined to do an MRI for 5k). I'm concerned since this seems pretty young for vestibular disease, and he has no signs of an ear infection or anything else that would make sense.
What kind of things could cause this? Should we take a neurology referral? TIA