Hello. Unfortunately, unless you can get to the bottom of the problem, these type conditions can be very difficult to cure. Bandaging while wearing a Elizabethan cone can help for a while, & if it can heal, the problem may be solved. But if this a recurrent injury, allergy, neurologic or even a compulsive-obsessive behavior, treatments are often a bit more complex involving long term medication & sometimes even amputation of most of the tail. The first thing the tail needs is antibiotics as the tail does look infected. I think you really need to see your veterinarian with Ramces to see why this has happened & what is the right direction to go in to heal things up. Thanks for using Petco Pet Education Center, formerly Petcoach.