Patty Lathan, DVM, DACVIM
Hypothyroidism is the most commonly diagnosed endocrinopathy in dogs, and is usually the result of lymphocytic thyroiditis or idiopathic atrophy.
"Cushing's syndrome," or hyperadrenocorticism (HAC), refers to the clinical signs associated with the presence of excess glucocorticoids in the body, either from exogenous administration or endogenous production.
Hypoadrenocorticism ("Addison's disease") is an uncommon disease in dogs. However, because of the potential for acute death in dogs with severe acid/base and electrolyte abnormalities, and the excellent prognosis with treatment, prompt diagnosis is crucial.