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Addisonâs disease most commonly affects female dogs around four or five years old. This condition is typically caused by injury to the adrenal glandsâ tissue from infection, hemorrhaging, or autoimmune disorders. If your pet is coming off of steroid treatment, the steroid withdrawal may also be causing an imbalance.
In an ACTH challenge test, the dog is given an injection of the adrenal stimulating hormone ACTH. A normal dog will respond by having an increase in blood cortisol. If a dog with Addison's disease is given ACTH, the dog will not have an increase in blood cortisol and the diagnosis of Addison's disease is confirmed.