I have a 5 yr old mare whom i have owned for 5 months. She is a joy to ride and handle. She is sensitive, but not "marish." She is turned out every morning for 4-5 hours and ridden 5/days/week. In the last 1 1/2 months she has started to kick the stall walls, resulting in 2 minor injuries with short time off. We have moved her 3 times now to see if it is her roomates. She is now in a corner stall with a wall to the next horse and continues to kick. Any suggestions??!