I have no experience with an inverted tail or amputation but everything I have read and heard recommends this to be a last resort because the tail has so many nerves there and the amputation could cause other problems. I do have experience with really tight tail pockets; our Amber has an extremely tight tail pocket and I have struggled with it since she was a puppy and I think Ruby is also going to have a really tight tail pocket. What I have found works great is an old water pik; I fill ours with a mixture of hydrogen peroxide, baking soda and a little salt and slide it in under the tail and turn it on. I works great; I was and still do use cloth diapers most of the time with witch hazel afterwards to get it dried out. An ointment I have found useful for almost anything is called oronine ointment, it is a japanese ointment you can buy in oriental stores or online as is the best stuff for both humans and furbabies. It really works as an antifungal. I use q-tips to apply it under the tail into the tail pocket. It keeps her tail pocket nice and clean and smell free. Ambers tail pocket gets cleaned about 3 times a week. I hope everything works out and good luck.