In October, I moved my mare to a new boarding situation in which she shares a loafing shed with another mare with a fence between them and they've clearly begun to bond. My mare is fine when she's with me and I'm engaging her mind, the other mare is...not. She has taken to starting to scream from the moment I arrive (you're going to take my friend away!!!!) and is in a frenzy the entire time I have my mare out and working, calling and running herself into a full on frothing sweat. My friend who owns that mare says that things will get better, the barn manager says things will get better...but things don't seem to be getting better. If anything, the behavior is escalating--she will try to break through gates when we walk by, she will stay in a full fit even if I only work my mare in her pasture so she can keep eyes on her the entire time...I don't know what to do. It's killing my motivation to go to the barn because I feel like I'm torturing a horse every time I go.