I think I've finally got Psycho Gwen figured out...
I lunged Coriander yesterday and today at the walk for 10 minutes. Well, mostly at the walk, he threw in a little canter just for fun. I don't blame him, the footing in the ring is really good right now and he's been plowing through snow and mud for a long time.
Yesterday I gave another try at lunging Gwen. She would circle around me once or twice and then stop and look at me, saying "where's my treat?" It's going to take a while before she understands what I'm looking for, but she kept herself to a walk and was very calm the whole time.
Today I had a totally different horse. Psycho Gwen was in. I wrangled her out to the ring with the lunge line but I knew before I got her out there that it would be pointless to try to lunge her. She kept screaming for Coriander the whole time I had him out and then she tried to circle around me all the way to the ring. I turned her loose and she took off galloping and bucking (Once again, WOW athletic. I'll try to video her some day). She would occasionally stop next to me for a treat but then take off again. She ran herself into quite a sweat.
I *think* she's in heat, but I'm used to seeing "hussy" heat. You know: teasing the boys, peeing all over, raised tails and winking. Gwen doesn't do that, she did seem to pee more than usual today but besides that I all have to go on was her being much more anxious than usual about being separated from Coriander. When I track back and look at my tags, the last times I saw Psycho Gwen were right in the middle of the month (February is missing but I don't think I noticed because the weather was so awful I didn't do anything with her in the middle of the month). It seems pretty likely that this behavior is hormonal, I guess I have a mare-y mare. Hmm, maybe I should look into Regu-mate?