Horse trying to kill other animals

It's just her being her. She's young, she's never been around those sort of animals, and she's probably moody since hormones and all that.
Like humans they all have different personalities and likes. I have a horse who absolutely hates deer. Stomped one to death once. He also hates certain people and will try to snap at them through the fence(luckily it's only two and I'm not very fond of them either).

Breeding- You may do as you please it's your horse after all, but I wouldn't recommend it at least until she's calms her little butt down. Because just think, that amount of aggression is going to be added onto some primal maternal instincts to protect her foal. Scary for all. ha

So here's my overall solutions to your problems with her: Time, More training, and Separation from her 'trigger' animals though keep them close by in cages if you can(she needs to get used to them).

KarateHorse said:

She is only 2 and a half years old. She was on a farm with other minis and chickens.

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She's pretty much the horse equivalent of a teenager, then - thinks she's all grown up, but still has a lot of learning and growing to do.

Syd was frisky and boisterous as a youngster, but it was about when she turned 2 that the horseplay began to get more assertive and purposeful. She used to chase chickens, too, but in a haphazard, playful way. I can remember being out there one time, trying to catch a flighty rooster, and seeing Syd head him off and head him back toward me; it occurred to me she would make a good sheep pony if I could just teach her the signals.

As for breeding . . . . I gotta admit, there's nothing cuter than a mini foal (the first time I saw Syd, she was only a couple of days old). At one point, I thought I wanted to breed minis, too. But there's not a lot of market for such expensive toys; an awful lot of them wind up being rescued (or desperately need to be). The thing that really settled that score once and for all for me was spending a couple of seasons on the Lil Beginnings and Marestare forums. I saw more foalings go horribly wrong; apparently, this happens a lot in minis. My heart still hurts for the 12-year-old girl who carefully researched conformation and bloodlines, bought a stallion and two mares with her own money, hand bred the mares so she'd know the due dates, and then lost both foals to different causes, and her favorite mare, too. In fact, that was one of the main reasons I bought Syd. As I said, I had known her from a foal. When her owner decided to sell her, I knew I needed Syd like I needed another hole in my head (my kids were still pretty young at the time, and definitely were at risk from her antics), but I couldn't stand the thought of her being stuck in a pasture with some stud to risk her life to produce $250 foals . . . so I bought her. Just a little food for thought. Anyway, I would definitely recommend that you join the Lil Beginnings Miniature Horse Forum, if you haven't already. It's a great place to learn about almost every aspect of miniature horses.

Update: The mini (named Jitterbug) hasn't gotten any better actually she has gotten worse. We got another mini (named Willow) at the same time we got Jitterbug. We just found out that Willow might be pregnant. Would Jitterbug try to stomp Willow's baby? Willow is higher in the pecking order then Jitterbug.

It would be a kindness to Willow to have her separated at the time of foaling; horses instinctively want to be alone during the crucial hours surrounding the birth. Once the foal is steady on its feet and has it firmly in its mind who mom is, you can try supervised introductions. Jitterbug will attempt to dominate the foal, that's normal. Just how rough she'll be is hard to say; sometimes young horses have problems figuring out just what is appropriate. Hopefully, Willow will be a good, protective mom, and keep her baby from getting hurt.

In the meantime, y'all need to be working with Jitterbug. It's coming on springtime; she's restless, itchy ( from shedding) and rather bored. A tired horse is a happy horse! There's a lot of ground work you can do with a mini; it will give her something to do with all that energy and enforce the idea of respecting humans.

Bunnylady said:

It would be a kindness to Willow to have her separated at the time of foaling; horses instinctively  want to be alone during the crucial hours surrounding the birth. Once the foal is steady on its feet and has it firmly in its mind who mom is, you can try supervised introductions. Jitterbug will attempt to dominate the foal, that's normal. Just how rough she'll be is hard to say; sometimes young horses have problems figuring out just what is appropriate. Hopefully, Willow will be a good, protective mom, and keep her baby from getting hurt.

In the meantime, y'all need to be working with Jitterbug. It's coming on springtime; she's restless, itchy ( from shedding) and rather  bored. A tired horse is a happy horse! There's a lot of ground work you can do with a mini; it will give her something to do with all that energy and enforce the idea of respecting humans.

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Thanks we will seperate and work with Jitterbug as much as possible.