Abstract
The aim of this case report is to describe the care of a canine patient in an Addisonian crisis, as well as the clinical conduct, laboratory findings and the treatment instituted, so that it can serve as a source of consultation for future patients. The patient had nonspecific clinical signs such as apathy, weight loss, anorexia, dehydration and hypotension during the first visit. The next day, during reassessment, he presented bradycardia, hypotension, hypoglycemia and dehydration. The electrocardiogram showed absence of P wave, T wave in a tent and widening of the QRS complex. Blood gas analysis was performed, which indicated severe hyperkalemia (9.1 mmol/L) and hyponatremia (129 mmol/L). Emergency treatment for Addisonian crisis was performed, and the patient responded in a satisfactory and quick manner. Hypoadrenocorticism is an endocrinopathy that can result in emergency care with an Addisonian crisis, with a high risk of death. However, it has a good prognosis when treated correctly.