Sometimes she's sweetness and light but other times, she's a teeth-baring monster. Yes, we've all had to manage a moody mare but help is at hand. A mare's behavior can change (often in springtime), and this can be due to a fluctuation in hormone levels, including estrogen and progesterone. This Daily Dose Equine Mare in Balance Horse Supplement is a natural way to control moods in mares. Use this horse supplement with adult-aged horses.