My dog Hendrix chews on his tail really badly. When we first got him it was really bad, We moved and got a puppy hoping it would help with his anxiety. It worked really well for about 4 months now it's really bad again. He has no fur on the end of his tail, just a big scab, He is only in his cage long enough for us to grocery shop and run errands, and is very active. I have tried eveything and am tired of scrubbing blood out of our clothes and walls. Thinking about docking... a vet tech friend suggested it. What are some thoughts?