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Hi, I can help you with your question today.
If you help him stand or walk, is he consistently falling or circling to the left?
Is his head tilted also?
OK, this could be due to a number of different things.
We can see signs like this from vestibular disease (which can be due to ear infections or start for no apparent reason), stroke, or a tumor. Although we could see problems from the steak and fries (gastroenteritis, pancreatitis), I would not expect him to consistently fall to the same side if that were his only issue.
I recommend having him seen by your local vet to confirm that he has a neurologic issue. If it is something as simple as an ear infection, it can resolve with treatment of the ear problem.
Head shaking, pawing at the ear, a smell or discharge from the ear - this things are not always consistent though. It is important to have an exam with an otoscope to see down to the ear drum, and we can also check ear discharge under the microscope.
If he is having vestibular problems, it is basically vertigo. These dogs are very dizzy; that's why they fall over when trying to stand or walk. This makes them very nauseous, and anorexia and vomiting are quite common to see.