I'm not sure how long a mare stays in heat... Is it a once a month thing? How long does it usually last? Is it different for every mare? Is there something you can give or do for a mare that can calm them down when they're in heat? I took Jez to the arena today and she saw a stallion and went berzerk. She nearly ran me over, got completely covered in sweat, then when we got back to the house, she started pacing the fence in her corral. Sometimes she gets so worked up, she'll pace for a solid day by the fence, not eating, drinking, pooping or stopping for a second and by the end of the day, she's so sore. What can I do to keep her from doing that? I know it's instinct but I don't want her to wear herself out like that.