My mare doesnt have anything around her tail I havent been able to get pics I have walking pneumonia been in and out of the ER I am working still but havent been able to get outside to play with the horses thank god my husband likes feeding and giving them attention.
It does appear to possibly be a rub mark from something. If not a saddle, could it possibly be a blanket/fly sheet?
I have had horses in the past who changed colors a little bit, but not quite that much. Would be interesting to see what happens! :)
No rub marks on her might have been a bite on her rear from the other mare but she has only been saddled twice and no drama with that just an introduction to saddle and pad and when that pic was taken it was like a month since her being saddled the white hairs have spread from her shoulders they are now clear back to her her back legs around her tail and underside