I recently brought home a yearling that injured herself shortly after. She had cleared our fence totally unprevoked. Her motive was unknown. She had an entire acre to herself to warm up. It’s a solid fence that she was very well aware of. Any way she go out and hit a wheel line going mock ninety and got laid open. She needed a lot of work and is required to stay sheltered for a week or so. We are on day two of her being in an indoor paddock. She is still attempting to jump out. She is incredibly anxious but doesn’t seem to be afraid of anything in the enviorment. She’s very easy when being handled but can’t work on anything due to the severity and location of the injury. I’m not sure what I can do at this point given the circomstances. She is motivation to be elsewhere no matter where she’s at.

ive tried introducing her to a few other yearlings and mares. She enjoyed their company but still eventually whipped around and tried for the fence. When I picked her up she was in a pen that could hold a freakin elephant. I’m not sure if her lack of respect for any form of fence is due to where she grew up in or if she thinks she has some destination.

i could use some suggestion on what I could do before she re-injures herself. 

i have had upwards of 50 different horses on my property through the years and have never had a horse so motivation to clear a fence. I’ve obviously experienced some young colts attempt it before but nothing to this extent.

I have a 2yo filly who is much like this. She tried to go through a heavy duty panel at 6mos or so, got stuck, and kicked a wound into her hock. I am starting to think that it's all about overstimulation and that her threshhold is very low, if that makes sense. She will throw herself over or down on the ground facing a new 'thing.' Then stand up and approach with a nbd attitude immediately. Strangest horse I've ever brought up. Last year this time I took the shedding blade out and she was loving it on her neck and chest so I naturally started moving back with the strokes. Went across her upper elbow area and she bolted, bounced off the centar fencing, tore through the electric fencing behind her run in shed, back through the electric (still zapping and adding to the craziness), then hit the centar fencing again. I left the pasture at that point because I wasn't in the mood for bloody messes that day. Came back in 30 minutes or so, nothing but a couple scrapes, and she stood there while I gave her dewormer. Really strange horse. 

My Demon goes to the trainer in the next 30 days or so. Her big bro is much calmer and easier to deal with as a stalled horse so we are hoping that she will be also. Her older bro did a lot of fence damage when he lived here in VA due to full speed sprints that got away from him and he'd either go through or try to stop and not quite make it and break a top rail.  

I have never tried any drugs on either of them. I would rather change diet (no sugar, high fat, lots of hay) than use pharmaceuticals for this. Peon still runs a bit strong at times, but is not hot, per se. We will see how Demon turns out.