My Dancer had a mat like you would not believe in her tail when we got her. Someone had braided bailing wire into her tail and left it - apparently for a couple of years! There was about a two foot long mat about 3/4 of the way toward the bottom of her tail.
I tried everthing I could think of to get that mat out. We had to cut part of the hair to get the wires out (her poor bum was all covered with scars from switching her tail and scratching her bum with the wire). There were three pieces of wire about four feet long each all braided in the hair. Once the wire was out, I soaked her tail with baby oil, W-D 40, leave in conditioner, regular conditioner, vaseline - you name it, I tried it. Nothing worked. We finally had to cut her tail when she got it caught on a tree branch and couldn't get loose.
I still have that mat. It looks like a hairy club - the grandkids have even used it as a baseball bat. I want to use it on whoever braided the wire in her tail in the first place. Her tail is still too short to suit me, but it will eventually grow back...I hope...
Plain Old Dee, horses Dancer and Rain I believe in dragons, unicorns, good men and other mythical creatures!