Addison's disease (hypoadrenocorticism) is an underdiagnosed condition in dogs where adrenal glands fail to produce essential hormones, causing crises that can be fatal without treatment.
Addisonian crises are life-threatening emergencies where dogs collapse into shock without apparent preceding illness. The episodic, vague nature of pre-crisis signs means many dogs suffer repeated unexplained illness before diagnosis. The condition creates chronic physiological stress as adrenal insufficiency affects metabolism, immune function, and response to any stressor. Once diagnosed and appropriately managed, however, Addisonian dogs can live fully normal, comfortable lives - making accurate diagnosis transformative for welfare.