Originally Posted by SlideStop
I say if you can just leave her be for a little while do that. When she is starting to be less moody after a week or two back to light work. It's a cycle, it will get better as it fades out. Usually takes about 20 days. If it goes beyond a month then I would look into a depo shot. Honestly, it all comes along with having a mare. Just like a stallion they have the urge to breed as well.
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Not all mares are like that. I got really lucky and got a mare that you can't even tell if she is in heat. I think I've noticed her in heat maybe 2-3 times in 3 years and only because I was riding her with a friend's horse and she "showed" to the other horse.
So I'm really of no help to the OP, sorry.
But I just wanted to say not all mares are moody. I've known a few others that were not as well. It seems to be maybe a 50/50 split between mares that REALLY come into heat and those that are more subtle and may not even show except to another horse and are generally no problem at all. I actually have very limited experience with mares (having only one) but my friends have mares as well and some are great all the time and some are moody. One is actually sweeter to other horses when she IS in heat. And is cranky when she isn't. So who knows about those girl horses!