Damn. We thought Arnold's first head tremor episode was due to a new antianxiety medicine we were trying. But our certified vet behaviorist said she was surprised that he'd have a reaction after only the 3 days he was on the medication.

Well, it's been 5 days since he had any of that, and he had another episode. Time to take him to the vet, and read up on "Idiopathic Head Tremor Syndrome".

UPDATE 2024: Over the past years, I've seen Arnold have a bit of a head shake a handful of times. Not quite as bad as this, and Arnold isn't as scared during anymore. So, maybe this wasn't the meds. Anyway, it has never cause him any harm.