My mare won't stop rubbing her mane. Vet has been out twice, gave her steroid shots and even took a skin sample back to the lab to check for worms, mites, etc.

Vet thinks it's become a habit at this point. It looks pretty bad as she's missing a good 8 inches right in the middle of her crest.

I tried one of those neck covers that race horses wear but she had it destroyed in about a day.

Any recommendations for indestructible neck covers or other remedies?