Addison's Disease in Dogs — Long-term Welfare Management

Hypoadrenocorticism (Addison's disease) is a life-threatening adrenal gland failure in dogs that is manageable with lifelong hormone replacement, but acute crises (Addisonian crises) are medical emergencies requiring immediate intervention.

Key Facts

Addison's disease is caused by destruction of the adrenal cortex, eliminating cortisol and aldosterone production
Standard poodles, Bearded Collies, and Portuguese Water Dogs are at elevated genetic risk
The classic presentation is vague — waxing and waning lethargy, vomiting, and weight loss — earning the name "the great pretender"
Addisonian crisis causes collapse, severe bradycardia, hyperkalaemia, and death within hours without treatment
Long-term management uses monthly desoxycorticosterone pivalate (DOCP) injections plus daily prednisolone
Dogs with Addison's require stress dosing (2-3x prednisolone) during illness, surgery, or significant stress
Prognosis with treatment is excellent — well-managed dogs have normal life expectancy and quality of life

Welfare Considerations

Addison's disease creates a biphasic welfare challenge: the severe acute crisis and the long-term management of a condition requiring lifelong hormone replacement. The Addisonian crisis is one of the most acute welfare emergencies in veterinary medicine — dogs collapse with severe cardiovascular compromise from hyperkalaemia-induced arrhythmia, and death can occur within hours without IV fluid resuscitation and corticosteroid administration. Dogs that survive crisis and are diagnosed face a very different welfare picture: well-managed Addisonian dogs on DOCP and prednisolone are clinically indistinguishable from normal dogs, with excellent energy, appetite, and quality of life. The management challenge is consistency: stress dosing during any illness or procedure is essential and owners must understand this protocol before any veterinary visit. The DOCP injection every 25-28 days is non-negotiable — missing injections causes electrolyte deterioration that can lead to crisis. Genetic screening programmes in at-risk breeds reduce the frequency of the condition in future generations.

What You Can Do

Know the Addison's emergency signs: sudden collapse, weakness, and vomiting in your dog need emergency care
Carry an emergency prednisolone prescription and letter for any hospitalisation or surgery
Never miss DOCP injections — electrolyte imbalance develops rapidly without aldosterone replacement
Alert all vets treating your dog that it has Addison's — stress dosing is required for any illness
Join the Addison's Dogs community for owner support and management guidance
Support genetic testing programmes in at-risk breeds to reduce hereditary disease frequency