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Hi. My name is***** I'm sorry to hear about this situation with Mohawk. How long has this shaking and seeming to loose balance been going on? How long ago did your vet last check him over?
On the veterinary side, there aren't really any good "toxicology" screens to run like you'd see on the human side where they are evaluating urine, blood, etc.. for a wide range of medications / drugs / etc.. Is he scratching at his ears? Does he seem sensitive to them? When he walks does he do that fairly normally? Is he still playing?
With what you're describing, I'm going to say that a toxicity / poisoning just doesn't seem to fit anything that I've come across in my career. So in saying that, a poisoning seems to be pretty unlikely. Could he have a visual issue? Could he have some retinal issue? Could there be an underlying neurologic issue? It is good that he's eating and drinking well.
Are you talking about a CT / MRI scan? For those non-specific neurological cases, that may be a diagnostic step that provides some critical information.