What is the difference between atypical and typical Addison's in dogs?
Ava Robinson
Updated on June 04, 2026
Atypical Addison's disease is "the great pretender" in veterinary medicine. While the stereotypical Addisonian patient loses function of the entire adrenal cortex, in the atypical case only portions of the zones are affected, resulting in a variety of clinical presentations.
Thereof, how is atypical Addisons disease diagnosed?
Diagnosis of Atypical Addison's Disease in Dogs
Diagnostic testing is done next, which includes laboratory tests and imaging. The most important tests your veterinarian will do are an ACTH-stimulation test to check cortisol levels, thyroid test to check thyroid function, and EKG to check the heart rhythm.
Subsequently, question is, what is Canine Addison's disease? Addison's disease (hypoadrenocorticism) is a hormonal disorder that is caused by a deficient production of the adrenal gland hormones, cortisol and aldosterone. The adrenal glands are two small glands located next to your dog's kidneys.
Likewise, how long will a dog live with Addison disease?
Fortunately, dogs usually feel better within several days of treatment, and most symptoms of Addison's disease are gone within two to four weeks. The majority of patients have a good prognosis and once they've been stabilized with the appropriate medications, most dogs resume normal lives.
How common is atypical Addison's disease in dogs?
The term describes dogs with adrenal glands that still produce mineralocorticoids but lack sufficient glucocorticoid production. Atypical Addison's disease used to be considered a much rarer condition than the classical Addisonian but now is identified in up to 30-45% of dogs diagnosed with the hypoadrenocortisism.
Related Question Answers
What are signs of Addison's disease in dogs?
Addisonian patients may present with lethargy, diarrhea, vomiting, increased thirst, increased urination, and unplanned weight loss. Intermittent shaking episodes are sometimes seen. The signs may wax and wane.What happens if you don't treat Addison's disease in dogs?
While the consequences can be serious, dogs can live a full life if properly treated. If left untreated, Addison's can result in death. Reduced aldosterone production can result in different serum levels of chloride, sodium and potassium.Does prednisone help Addison's disease?
All treatment for Addison's disease involves medication. You will be given hormone replacement therapy to correct the levels of steroid hormones your body isn't producing. Some options for treatment include oral corticosteroids such as: Hydrocortisone (Cortef), prednisone or methylprednisolone to replace cortisol.What mimics Addison's disease?
Other causes include congenital adrenal hyperplasia, congenital lipoid adrenal hyperplasia, X-linked adrenoleukodystrophy, familial glucocorticoid deficiency. Various syndromes associated with Addison's disease include Triple A syndrome, Smith-Lemli-Opitz syndrome, Kearns-Sayre syndrome.Is Addison's disease painful?
During an addisonian crisis, affected individuals may develop a sudden loss of strength; severe pain in the lower back, abdomen or legs; vomiting and diarrhea potentially causing dehydration; and low blood pressure and loss of consciousness.Is Addison's disease life threatening?
People with Addison's disease must be constantly aware of the risk of a sudden worsening of symptoms, called an adrenal crisis. This can happen when the levels of cortisol in your body fall significantly. An adrenal crisis is a medical emergency. If left untreated, it can be fatal.Does Addison's disease shorten a dog's life?
Addison's disease, scientifically known as hypoadrenocorticism, is a disease with serious consequences for dogs, although fortunately with proper treatment, dogs diagnosed with Addison's disease are expected to have normal lifespans.Why do dogs with Addison's disease need prednisone?
One component of therapy is to replace the cortisol deficiency with an oral steroid (prednisone). This is easy to do and inexpensive. It is equally critical to replace the aldosterone deficiency as this hormone helps maintain normal electrolyte concentrations, fluid balance, and acid-base status.How do you check a dog's cortisol level?
An ACTH stimulation test takes 1 hour to perform: a blood sample is taken, a small amount of synthetic ACTH hormone is injected and another blood sample is taken 1 hour later. Cortisol levels are obtained and if the second cortisol is elevated Cushing's Disease is diagnosed.What is resting cortisol?
A resting cortisol is a single, random blood cortisol level. The ACTH stimulation test is performed by measuring the cortisol levels before and one hour after a medication is then given that stimulates the adrenal glands.Do Addison dogs need prednisone?
For chronic management, all patients with Addison's disease will require replacement of glucocorticoids (usually prednisone), and most patients require replacement of mineralocorticoids with either desoxycorticosterone pivalate or fludrocortisone.Why does Addison's cause Hypoalbuminemia?
The pathophysiologic mechanism driving hypoalbuminemia in hypoadrenocorticism is unknown. Loss of albumin into the GI tract or decreased intake/assimilation of proteins, is the main suspected cause (4).What is the difference between Addison's disease and Cushing's disease in dogs?
Cushing's syndrome is the opposite of Addison's: it is an excess of cortisol. However, other levels of the adrenal cortex are usually not significantly affected, therefore, electrolytes are normal.What causes low cortisol levels?
Secondary adrenal insufficiency occurs when the pituitary gland is unable to make enough adrenocorticotropin hormone (ACTH). ACTH sends a signal to the adrenal glands and stimulates them to make cortisol. If the pituitary gland does not make enough ACTH, the body will have low levels of cortisol.How expensive is it to treat a dog with Addison's disease?
Medical treatment can be as low as $50 a month or as high as $200, depending on the dog's response to treatment and the drug(s) selected. Frequent lab work must also be factored in to the cost structure to ensure that patients are responding appropriately.What are the stages of Addison's disease?
Development Stages of Autoimmune Adrenalitis| Stage | Symptoms |
|---|---|
| 2. Precipitating event starts antiadrenal autoimmunity | None |
| 3. 21-hydroxylase antibodies present | None |
| 4. Metabolic decompensation | Fatigue, anorexia, nausea, hyperpigmentation |
| 5. Decreased response to ACTH stimulation | Hypotension and shock (addisonian crisis) |
