Dog Addison's Disease: Recognising and Managing Hypoadrenocorticism

Addison's disease in dogs involves insufficient adrenal hormone production, causing vague but serious symptoms. Early diagnosis and lifelong management enable affected dogs to live well.

Key Facts

Hypoadrenocorticism (Addison's disease) results from destruction of adrenal cortex tissue, reducing cortisol and aldosterone production
It is often called "the great pretender" because symptoms — lethargy, vomiting, weakness — mimic many other conditions
Standard Poodles, Portuguese Water Dogs, Bearded Collies, and Nova Scotia Duck Tolling Retrievers are over-represented
Addisonian crisis is a life-threatening emergency characterised by collapse, severe weakness, and cardiovascular shock
Diagnosis requires an ACTH stimulation test showing inadequate cortisol response
Treatment typically involves monthly DOCP (desoxycorticosterone pivalate) injections plus daily oral prednisolone
With proper management, most Addisonian dogs live normal lifespans with excellent quality of life
Stress dosing — temporarily increasing glucocorticoid during illness or surgery — is critical to prevent crisis

Welfare Considerations

Undiagnosed Addison's disease causes prolonged suffering through recurrent episodes of weakness, nausea, and malaise. Dogs may be misdiagnosed with gastrointestinal disease, kidney disease, or behavioural issues for months or years before the correct diagnosis is reached. Addisonian crises are acutely life-threatening and extremely distressing. Once diagnosed and stabilised, the welfare outlook transforms dramatically — most dogs become energetic and comfortable. Owner education about stress dosing, crisis recognition, and consistent medication schedules is essential for preventing preventable emergencies.

What You Can Do

If your dog has recurrent vague illness episodes, ask your vet to consider Addison's disease testing
Ensure any Addisonian dog wears a medical alert tag identifying the condition
Learn to recognise crisis signs: collapse, extreme weakness, cold extremities — seek emergency care immediately
Follow stress dosing protocols prescribed by your vet during illness, surgery, or major stress
Maintain consistent medication schedules — even brief lapses can trigger crises
Join owner communities for support with managing this lifelong condition
Advocate for broader awareness of Addison's disease in veterinary and owner education materials