The tail in question has almost and S-shaped curve in the top of the tailbone, about 4" from the top, and it continues down about 6", and twists so that the underside of her dock is actually facing to the left. The tail has very little movement in it, really the only thing she can do with it is to clamp it against her right cheek. She's not able to swish it at all, so she's stalled during the day when horseflies are out and biting. The vets first suspected herpes, but that was ruled out. We recently brought her to the LSU vet clinic, where they did x-rays, and amazingly, there was no evidence of any breaks or other trauma to the bones. They have also ruled out any neurological problem.
Aside from the main issue of not being able to protect herself from biting flies, the most troubling part of this is that she rubs her tail so badly that she has a raw, bleeding sore about 2" x 6" on the left side of her tailbone, close to the top of the tail. She has been checked for worms, and she is on daily wormer as well. The vets have no idea what's going on. We are in the process of trying to find out why she rubs it; she's on antihistamines to see if she's rubbing it because it itches (so far that's not helping) the next step is pain meds to see if she's doing it b/c it hurts, and after that, they want to do an MRI to see if there is tendon or ligament damage. The last resort would be amputation-- I don't think we'll choose that route, unless it's in her best intrest.
So if it hasn't been broken, and it's not neurological, or any sort of viral thing, what the hell could it be? I've been wrapping it 2x a day at least, since she likes to take the wrap off and rub it til it bleeds, and she has topical treatments to help heal the wound. I have gotten the wound completely healed over the winter, but she's torn it up again from being inside during the day (in the winter it's covered by her blanket, so she can't do too much damage to it then.)
Does anyone want to take a guess? Or has anyone seen something like this before? Brainstorming would be welcome, since after $400 the vet's best answer was, "I don't know."
Thanks in advance.