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I am sorry Whitey is not feeling well.
It is possible he is experiencing a potassium deficiency causing hypokalemia and muscle weakness.
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You can give him an ounce of milk which contains potassium and see if his symptoms improve A vestibular issue related to an ear infection is also possible as it produces similar symptoms:
His dosage of tapizole may need adjustment. So, it is best to get him to the vet as soon as they open.
Please let me know what is found and how Whitey is doing.
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