why is my ferrit bald?

Brief：
my ferrit is 3 yr old she started goin bald a year ago she is other wise healthy but she is baldAnswers: Im not going to recite a veterinary web site .. 

In most cases, diagnosis is based on clinical signs. Complete blood counts and chemistry panels will be within normal limits in the vast majority of animals, except in longstanding cases in which anemia or decreased platelet numbers may be seen. As the elevated hormone in AAE is estrogen, not cortisol, practitioners should be aware that serum cortisol is rarely if ever elevated, and diagnostic testing for Cushing's disease will be of little or no diagnostic value. While serum levels of estradiol may be measured at commercial labs, elevation of estradiol precursors or intermediates are responsible for clinical signs in many cases, and estradiol measurements may be within normal ranges. A new blood panel is available at the Department of Endocrinology at the University of Tennessee College of Veterinary Medicine which measures not only levels of serum estradiol but six other intermediates. Although the test is extremely sensitive (resulting in positive diagnosis in over 90% of cases) it is expensive and takes several weeks to complete, and should be reserved for cases in which clinical signs are marginal.

The most effective treatment of AAE is surgical removal of the affected adrenal gland. Exploratory laparotomy often reveals unilateral enlargement of one or both adrenal glands beyond the normal 3-5 mm. For unknown reasons, over 80% of proliferative adrenal lesions are located in the left adrenal gland. In approximately 15% of cases, lesions are bilateral. Unilateral adrenalectomy results in a cessation of clinical signs and hair regrowth in the majority of cases. Hair regrowth should begin within 2-6 weeks, or may be delayed until the next shedding cycle. However, in animals in with bilateral disease, hair regrowth may be shortlived, or not seen at all. In these cases, hemiadrenalectomy of the remaining adrenal gland should be strongly considered. Recently, a protocol was published in Modern Ferret for corticosteroid replacement in animals having undergone bilateral adrenalectomy by Dr. Joseph Bock. Bilateral adrenalectomy may be required in cases in which bilateral adrenocortical carcinomas develop. While much more research is required in this area, the possibility of exogenous maintenance of adrenalectomized ferrets now gives added hope in the treatment of adrenal neoplasia in ferrets.