Addison's disease (hypoadrenocorticism) causes life-threatening crises when untreated but responds excellently to management, allowing dogs to live normal, comfortable lives with appropriate hormone replacement.
Addison's disease demonstrates how a potentially fatal condition can be transformed into a manageable one with accurate diagnosis and appropriate long-term treatment. Dogs in an Addisonian crisis are profoundly unwell — collapsing, weak, vomiting, with dangerous electrolyte imbalances causing cardiac arrhythmias and shock. The welfare cost of a crisis is severe and acute. However, dogs that receive accurate diagnosis and appropriate mineralocorticoid and glucocorticoid replacement typically achieve full return to normal quality of life and are indistinguishable in daily function from unaffected dogs. The welfare challenge is primarily in the period before diagnosis — Addison's is often missed or delayed because its episodic, non-specific signs do not prompt the specific testing required for diagnosis. During these periods dogs experience recurring episodes of malaise and weakness without effective treatment. Owners of diagnosed dogs should carry emergency cortisol supplementation for crisis situations and understand the circumstances (stress, surgery, illness) that require dose adjustment. Regular monitoring of electrolytes and clinical condition ensures management remains adequate as the disease is typically permanent.