Addison’s disease is an endocrine disorder where the adrenal glands, near the kidneys, fail to produce enough hormones. This disease is relatively uncommon (approximately one case per 3000 dogs) but it is more common in dogs than humans. It is very rare in cats.
The common symptoms of Addison’s are lethargy, occasional vomiting or diarrhea, weakness, low body temperature, low heart rate, and shaking. The symptoms are often vague, may be intermittent, and can be attributed to many other causes. The problem is probably under-diagnosed; the doctor must have a high degree of clinical suspicion. The disease can be fatal if left untreated.