Yep, a lot of times it's hormonal. A lot of times I've had TB mares that would become studly during race training due to a lot of the stuff the were given (feed, medication, etc). Three years ago I had 2 grey mares who were half-sisters and when I would turn them out in separate pens (about 5 feet of space between them), they would not only act extremely studdish and try to fight each other, but they'd also act that way to an actual stud horse we put in another pen. Eventually a schedule was made to turn them all out at different times because the two mares were so awful about it. I still find plenty of mares who act completely studdish, but I know it's usually due to hormonal influences.

I've never seen a non-race horse act that way though... Maybe draw blood to see if she has any imbalances?

Zurhia said: Have you ever considered attending elementary school, or opening a dictionary? I won't tell you how it ends, I don't want to ruin the surprise, but it's a REALLY GOOD BOOK..