Hypoadrenocorticism (Addison's disease) is a potentially fatal endocrine emergency in dogs when undiagnosed, but well-managed Addisonian dogs can have excellent quality of life with appropriate treatment.
Addisonian crisis causes severe acute welfare suffering — cardiovascular collapse, profound weakness, and electrolyte imbalance create an acute medical emergency. Dogs in Addisonian crisis are in genuine danger of dying within hours without appropriate treatment. Diagnosis is frequently delayed because the vague waxing-and-waning signs of early Addison's are non-specific — owners and vets may attribute episodes to gastrointestinal disease or stress. The "Great Pretender" reputation of Addison's reflects its ability to mimic many other conditions. Once diagnosed and appropriately treated, Addisonian dogs have excellent quality of life — the condition is highly manageable, and most affected dogs live normal lifespans with appropriate medication and veterinary monitoring.