Lauren and Zaphod, >hair loss and pink colored skin over his shoulders >vet said it is caused by natural folds In my experience this is not normal, and is not caused by folds of skin (like it can be in Bulldogs and Shar Pei's). Hair loss is usually the result of an adrenal tumor. The hair loss usually involves the tail, the hair over the rump above the tail, the shoulder blades, and the hair on the top of the rear feet (the top of the rear feet are almost always involved, although its not mentioned in the literature-----there should be the same amount of hair covering the front and back feet). As the tumor progresses othet symptoms you can see include: lethargy (less playful then normal), thinning of the skin, abdominal distention, swollen vulva (in the female), return to mounting behavior in the neutered male. Adrenal tumors are very common in ferrets and are easily treatable with surgical removal if caught early enough. Other potential causes of hair loss over the shoulders is rough play between ferrets where one bites the other over the shoulder blades or neck. External parasites (fleas or sarcoptic mange) which are easily detected by your veterinarian if present. Good luck Dr Weiss 301-299-4142 [Posted in FML issue 1335]