Okay, one of the horses I have been training during the week was fine the first couple of days. Then yesterday, she turned into a bi$ch to catch, started bucking with the saddle the first couple circles of longing, she freaks out when I'm ground driving her, I give a little wiggle to turn right and she explodes and takes off to the left. Wiggle to the left, she explodes to the right. Then after we worked that out today, I got on her and she was extremely spooky, I would try to turn her and she would start backing up and act like she wanted to go up, so I of course, jumped off. I refuse to stay on a horse that is going to rear. So I get off and lunge her some more and she just stops and throws herself over backwards! I don't understand, yesterday was the first day of her heat, but I have never met a horse that was this bipolar. The second day I rode her she was nice, moving off my legs, nice and soft and calm, easy to catch and super sweet. Next day...crazy horse. Today after she threw herself backwards I lunged her and ground drove her again until she was a little calmer, then got back on. Sh still wanted to go back, so I just kept the reins loose, turned her head and drove her in a circle every time she tried to go back. Are there any other things I can try? Today I had to get off a few times because I was just shaking I was so scared she was going over on me. So I got off and walked her around so we both could relax. I'm just glad the other mare is like a complete different horse, I couldn't handle two crazies. I can do bucking, but I won't even try to ride a horse that rears. Do I just need to stick with ground driving for awhile? After a few minutes of ground driving she starts to listen, but once I get on it is just different. Would pain from being in heat be enough to cause a horse to rear? I would understand bucking, but not this. This is why I stick with the boys