Q. Scratching ear and shaking head. Drinking lg. Amts. Of water and lethargic

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A. Scratching ear and shaking head is a classic symptom of Otitis that means inflammation of the ears normally by infection.
Drinking loads and been lethargic is a different scenario. Is called Polidipsia and could be a symptom of Diabetes, Cushing's syndrome, Kidney or Liver failure etc.
Sounds that your dog/cat need a urgent visit to the vets. Best of luck!

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