My girlfriend has Ferrets and has had many develop the Adrenal disease with the hair loss. Some have done ok. One had successful expensive surgery and one didn't make it through the surgery. It is a very hard decision to make as the surgery is expensive and not all pull through and most of hers have been close to 5 years old which is at the far end of their life expectancy. Maybe you can wait and see how he progresses. Good luck |