Addisonian Crisis in Dogs: Recognising an Adrenal Emergency

Addison's disease (hypoadrenocorticism) in dogs is a serious endocrine disorder, and its acute form — Addisonian crisis — is a life-threatening emergency requiring immediate veterinary treatment.

Key Facts

Addison's disease results from insufficient production of cortisol and aldosterone by the adrenal glands
It is most common in young to middle-aged female dogs, with certain breeds like Standard Poodles and Bearded Collies at higher risk
Addisonian crisis is triggered by severe physiological stress in a dog with undiagnosed or inadequately managed disease
Signs include profound weakness or collapse, vomiting, diarrhoea, shaking, bradycardia, and hypovolaemic shock
The hallmark "great pretender" label reflects how Addison's can mimic many other conditions, causing diagnostic delays
Diagnosis is confirmed by an ACTH stimulation test measuring cortisol response; low sodium:potassium ratio is a key clue
With appropriate long-term management — DOCP injections and oral prednisolone — most dogs live normal lifespans

Welfare Considerations

Addisonian crisis causes severe suffering: dogs experience extreme weakness, abdominal pain, nausea, confusion, and cardiovascular collapse. Because the disease is rare and mimics many other conditions, diagnostic delays are common, prolonging suffering. Dogs managed on inadequate or inconsistent medication may cycle through repeated crises, each causing significant distress. The disease itself requires lifelong treatment, and owners must understand the need for increased steroid dosing during stress events (surgery, illness, travel). With good management, dogs with Addison's can live full, comfortable lives — making early diagnosis and owner education critical welfare priorities.

What You Can Do

Know the signs of Addisonian crisis: sudden collapse, extreme weakness, vomiting, and shock in a previously well dog
Seek emergency veterinary care immediately if your dog shows signs of Addisonian crisis
Request an ACTH stimulation test if your vet is puzzled by recurrent unexplained illness
Ensure consistent medication and discuss stress-dosing protocols with your vet for high-risk situations
Consider pet health insurance to cover the ongoing costs of Addison's management
Connect with Addison's disease support communities for breed-specific guidance and management tips