A 7-year-old intact male Golden Retriever presents with polyuria, polydipsia, bilateral symmetric alopecia, and a pendulous abdomen. CBC shows a mild non-regenerative anemia. Serum chemistry reveals elevated ALP at 850 U/L and hypercholesterolemia. Urine specific gravity is 1.008. Low-dose dexamethasone suppression test (LDDST) shows cortisol at 1.9 µg/dL at 4 hours and 2.1 µg/dL at 8 hours. Which of the following is the most accurate interpretation?

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