A 9-year-old male German shepherd dog was evaluated for clinical and clinico-pathological changes that were suggestive of Addison's disease. On further investigation the basal plasma cortisol concentration was high, a normal cortisol response to ACTH stimulation occurred, plasma renin activity was elevated and low serum aldosterone concentration was present. A diagnosis of hyperreninaemic hypoaldosteronism was made. Replacement fludrocortisone resulted in complete normalisation of the electrolyte and fluid imbalances. Hyperreninaemic hypoaldosteronism has never been reported in the dog.
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Remo Lobetti (1998) studied this question.
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