An Addisonian crisis is a life-threatening complication that can occur when the disease is left untreated. The adrenal cortex produces aldosterone which is important for electrolyte regulation and blood pressure. An Addisonian crisis can occur when 90% or more of the adrenal cortex is not functioning. It requires immediate veterinary intervention to reverse the crisis and restore gland function. Early diagnosis and treatment of Addison’s disease are important to prevent an Addisonian crisis from occurring. If your dog exhibits any signs or symptoms of this condition, be sure to act quickly and consult a vet for help.