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Hyporeninemic Hypoaldosteronism in the Dog

A 13-year-old female spayed Yorkshire Terrier, weighing 6.1 kg, was referred to the Internal Medicine Service of The Animal Medical Center for hypercalcemia and hyperkalemia. Active medical problems included mild stable azotemia of 11 months duration (International Renal Interest Society Stage II, http://www.iris-kidney.com) and collapsing trachea. The owner also reported a lifelong history of infrequent seizures.