Hi, I was wondering if anyone knew what it means when my mare is eating wooden fence post rails? Is there something she is lacking in her diet? She actually brought the fence down and went for a walk around the area. Nobody could catch her - she made her own way back into the paddock which was a surprise - the electric fencing at the time didn't work, which has now been fixed. Hopefully she can't do it again. Any help would be appreciated, thank you.