Addison's Disease in Dogs: Lifelong Management of Adrenal Insufficiency

Hypoadrenocorticism (Addison's disease) is an underdiagnosed condition in dogs caused by adrenal gland failure, requiring lifelong hormone supplementation but allowing excellent quality of life when properly managed.

Key Facts

Addison's disease results from destruction of the adrenal cortex, causing deficiency of glucocorticoids and mineralocorticoids
Standard poodles, Portuguese water dogs, bearded collies, and Nova Scotia duck tolling retrievers have higher breed prevalence
The condition is often called "the great pretender" because clinical signs (lethargy, vomiting, weakness) mimic many other diseases
Addisonian crisis — acute collapse with severe electrolyte imbalance — can be fatal within hours without treatment
Diagnosis relies on ACTH stimulation test showing failure of cortisol response; electrolyte abnormalities (high K, low Na) are characteristic
Long-term management involves monthly mineralocorticoid injections (DOCP) or daily fludrocortisone tablets, plus glucocorticoids during stress
Dogs managed appropriately live normal lifespans with excellent quality of life
Owner education about "stress dosing" during illness, surgery, or travel is critical to preventing crises

Welfare Considerations

Addison's disease causes significant acute welfare harm during crisis episodes — collapse, severe weakness, vomiting, and cardiovascular shock are distressing and life-threatening. Dogs in undiagnosed Addison's disease may experience recurrent episodes of malaise and weakness that impair their quality of life for months before diagnosis. The welfare trajectory changes dramatically after diagnosis and stabilisation: with appropriate management, Addisonian dogs typically return to full activity, normal appetite, and engagement with valued activities. The primary long-term welfare risks are inadequate stress dosing during intercurrent illness (which can precipitate crisis) and owner non-compliance with regular medication. Regular monitoring of electrolytes and clinical condition enables timely adjustment of treatment.

What You Can Do

Learn the signs of Addisonian crisis in at-risk breeds and seek emergency care immediately if they occur
Ensure your vet checks electrolytes in dogs with recurrent vague illness, particularly of at-risk breeds
Never stop or reduce mineralocorticoid medication without veterinary guidance
Carry an emergency glucocorticoid supply for your Addisonian dog during travel or when normal vet access is limited
Join Addison's disease support communities for dogs to access shared owner experience and management resources