Got a new broodmare. She foundered the day I brought her home so she has been in a stall for two weeks. Turned her out today. She’s bad. She chased my other two mares for a really long time and if they tried to stop, she ran backwards kicking at them. Long story short I don’t have another pen I can put her in. She was checked in foal yesterday. What the heck do I do? Have any of you ever fixed a horse with pasture manner issues? How? 

I dont need her to be complacent but not dangerous would be nice. 

Probably why they sold her. 

....yeah I’m gathering that. I didn’t expect it because we are “friends” 

That sucks.  Maybe try a shock collar on her......with a long range so you can watch from afar.

So that was the first time she was turned out with your other horses since you got her? Maybe just try to give it some more time.. can you stall the others and turn her out by herself a few days ? Then maybe just try turning her in with 1 horse for a day or so? Kinda different situation but when we brought my 3 yr old back from the trainer and I just turned him in the pasture with his long time pasture mates, the old man chased him alllll day long .... it was ridiculous.  I had to lock one up and when I'd let old fart out hed go over to my 3 yr olds stall front and mean mug him all day .. it took about 2 weeks for everything to settle down... now they stand there and itch each others back. As long as there is plenty of room for the other horses to get away from satan I say let them work it out on their own ... 

There's a chance it wont last forever, its just putting up with it until the new passes. I have a gelding who picks picks picks. Runs them through the fence and all. We've added 2 in the last year and keep them all in one pasture as well. One was a pony, took a month but he finally gave up. I did end up taking my nice mare and putting her and the pony in the round pen for a few days, she gets along with everyone and thought maybe that might make the transition easier, it seemed to work.

We took on another mare of my BIL, not really by choice but same deal, she was out every day for a week or so then he gives up, sure makes it a pain, but does eventually pass.

Thank you guys for the input. I have never had this before and I sure didn't get warned about it. I will try introducing slower and see what happens. I have always been under the impression that letting them do their natural herd thing was the best way to go but I have never put Satan in my pasture before LOL 

This is surprising 

Shes probably just trying to establish dominance right from the get go.. some horses just have that need to be the top of the totem pole. She may have been at the top where she came from. I'm sure it'll be fine.. it's hard to watch, I know when my old horse was constantly chasing my young horse, even though I knew hed never be able to catch him, it infuriated me to the point where I wanted to find the old grump a new home lol! They worked it out and what's funny the most dominant horse in my pasture didnt do anything that whole time... he probably thought they were stupid running around the pasture all day. He knew his spot was secure so he let those two ding dongs battle it out on their own 

Burros can work wonders on mean, chargy horses. Some are just too mean to be worth the hassle, though. I had an aggressive gelding for a few years, and when I did have him turned out with others I was constantly stressed about who he would attack or run through the fence next. He might be fine for months, then get ****ed one day and try to kill one of the others. He was relentless when that switch was clicked.

Take them for a trailer ride together.  It works at our house.  If my dominate horses are chasing a new horse, we stick them in the trailer and go for a ride, works everytime for us.

Reserpine.

sometimes it works, sometimes it doesnt. Check with your vet on effects of it on a pregnant broodmare.

Has she been housed next to the other horses that you tried to turn her out with? We will usually put them in neighboring pastures or pens for a couple weeks to allow them to get to know each other with a barrier there. Then once we put them in with each other the aggression isn't usually so bad. They still pick at each other and establish their pecking order, but it's significantly less dramatic.

You need my gelding. . . he doesn't bother anyone unless you give him a reason to. Then he takes zero $h!T from anyone. When we have one causing problems, we move them over to his pen and he sets them straight really fast. 

I’m not sure I’m understanding. So you got the horse, she foundered, was in a stall for two weeks and then you just threw her out with your other horses? Did you introduce them at all? Or just kick her out? 

Because if you just kicked her out without introducing her...I’m sorry...but that’s on YOU. She’s a prey animal. Survival of the fittest. If she’s been an alpha...of course she’s going to assert her dominance when thrown out with strange horses that are already in an established pecking order. It doesn’t mean she’s nasty. It means she was set up to fail by not being allowed to get to know her new herd over a fence first.

 I agree with SKM,,, I never just put a new horse out in pasture with out first letting them get to know one another, I always keep the newbie in a separate area but to where they can talk to each other and smell one another for at least two weeks, then the pecking order comes into place once the newbie is with the others. But just to throw one into the mix is asking for trouble. 

Have you thought about talking with the friend who sold you the mare ?  If you are friends you should be able to ask her questions about the mare. The founder really bothers me. Why would she founder ? When we have bought mares for our breeding program, we never had one founder or be mean when we got them here & they came from a different state. This is a sad deal. I hope you can talk with your friend & get things to work out for you, your former mares & this new one.