I'm currently working with a 14.2HH paint mare who has developed a fear of walking out the barn door. Her pasture is connected to the barn, so in the morning her owners typically open her stall door and let her out on her own, and she will trot/canter out. If you tack her up in the aisle, and try and lead her out, she'll either put on the brakes and put er in reverse, dragging me backwards, or bolt through the door, taking me with her.
Currently the only explanation we have is that she might be scared of the shadows cast by the overhang (about 5 feet) at the end of the barn. The two doors are very wide. She was vetted on Monday and is completely clear, good vision and all. Today I may attempt to back her out of the barn or take her out the other end and through the gate, but what are your thoughts on this?