A. Yes it could be due to a concomitant Cushing's disease or it could be secondary hypercalcemic state caused by the anal sac carcinoma. Often these tumors can cause high calcium levels, because of the production of certain molecule very similar to an hormon called parathormone. Skin condition ( thinner skin than normal and and hair loss an dry coat) could be caused by Cushing's disease though. Blood tests are available to rule out Cushing. Ask your veterinarian which blood test he wants to perform.
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