Oh Boy! Do I know exactly what you are going through. Buster, my first rescue, vizsla mix, came home with this issue. From spinning in the kennel (severe anxiety). My walls looked like a crime scene!
Well, 4 tail docking surgeries later......he has a boxer NUB! LOL And has the bean down too!
Some dogs just refuse to heal. Buster's bandage was excellent and did the purpose great..........until he knocked it again. Sigh.....
What happened to his was that the 3rd vert from the tip was broken and swollen......didn't really visably see it. Well, that cause the blood pressure to build in the tip area. Hence the endless streams of blood. His first docking was between the 3rd and 4th from the tip. Would have healed, probably, if it didn't get infected and start the whole process over again. The second docking was immediate. To fresh tissue and un-injured vertebrae. Well, that was worse! It was a length that was in his way every time he would sit or lay down. Always in pain. Always crying. I just couldn't bear him going through this within the first month of finding his forever home. Went in the forth and last docking........"take it down Boxer Style! I said.....just like Lily's!" No muss, no fuss. He healed up beautifully without the discomfort of it's length.
I wanted to share this experience in case you have to head down the same road. If you need to dock, go for the boxer dock, short or long. Don't do a few and have a funky sized tail.....make it easy on the dog. But make sure to measure from the base of the tail to the floor and dock it a tiny shorter! LOL Will save them so much pain. It's a difficult amputation, especially the older they are.