Addison's Disease in Dogs: Lifelong Management and Welfare

Canine hypoadrenocorticism (Addison's disease) is a life-threatening but manageable endocrine disorder requiring lifelong hormone replacement, with acute crises (Addisonian crisis) representing welfare emergencies.

Key Facts

Addison's disease results from immune-mediated destruction of the adrenal cortex, causing cortisol and aldosterone deficiency
Young to middle-aged females are most commonly affected; Standard Poodles, Portuguese Water Dogs, and Bearded Collies are predisposed
Classic signs include lethargy, vomiting, diarrhoea, and episodic weakness that wax and wane with stress
Addisonian crisis presents as cardiovascular collapse, severe weakness, and hypoglycaemia requiring emergency treatment
Diagnosis involves an ACTH stimulation test demonstrating inadequate cortisol response
Monthly injections of desoxycorticosterone pivalate (DOCP) replace mineralocorticoids; daily prednisolone replaces glucocorticoids
With appropriate management, affected dogs have a normal life expectancy and quality of life

Welfare Considerations

Addison's disease causes chronic, fluctuating illness before diagnosis — dogs experience episodic weakness, nausea, and lethargy that is often attributed to other causes for months. The Addisonian crisis is a genuine welfare emergency: cardiovascular collapse, extreme weakness, and profound electrolyte disturbances cause acute suffering and can be rapidly fatal without treatment. Post-diagnosis, appropriate management transforms these dogs dramatically — owners often describe their dog as "a completely different animal" after starting treatment. The ongoing management burden is primarily on owners: monthly injections and daily tablets are non-negotiable. Stress — illness, travel, boarding — requires temporary glucocorticoid dose increases. With good owner education and compliance, welfare outcomes are excellent.

What You Can Do

Seek veterinary assessment for dogs with episodic weakness, vomiting, and lethargy — Addison's is often called "the great pretender"
Pursue an ACTH stimulation test rather than relying on basal cortisol alone for diagnosis
Administer DOCP injections monthly without lapses — electrolyte crises can develop within weeks of missed doses
Learn to recognise signs of Addisonian crisis — sudden severe weakness, collapse — and seek emergency care immediately
Increase glucocorticoid doses during periods of stress, surgery, or illness as directed by your vet