This article separates a couple kinds of Addison’s from the typical kind which has signs referrable to glucocorticoid *AND* mineralocorticoid lack.
But, the “atypical” HoAC doesn’t have electrolyte disorders (low sodium and high potassium) and may be managed with nothing but Prednisone at a dose low enough to manage the glucocorticoid deficiency say, 0.15mg.lb once or twice a day.
Therapy for atypical HOAC consists of replacement of cortisol, usually with prednisone, given at 0.1–0.25 mg/kg/day, as directed for patients with classic HOAC. The goal is to give enough prednisone to control the clinical signs of HOAC, while not causing side effects of prednisone administration.
Additional prednisone (twice normal) is recommended during times of stress.
Dogs with atypical HOAC sometimes develop signs of mineralocorticoid deficiency (electrolyte abnormalities) weeks to months after the initial diagnosis (usually within 1 year). It is impossible to predict which dogs will develop electrolyte abnormalities; therefore, reevaluation of the electrolytes is recommended at 1 and 3 months following initial diagnosis and then every 6 months thereafter.