Sending healing thoughts over, and if this is the second time your horses have been injured by this fence I would certainly be changing either farm or fence. Make sure to have electricity in your wires if you use smooth wire or tape. And if your horse already likes to look for ways to pop over the fence, don't use plastic temporary fence, those are crap and are only for VERY temporary arrangements. Metal t-posts with caps, and 2 or more lines of wire. I've read somewhere that the best fence's top wire is up to the withers of the tallest horse in the pasture and bottom wire no more than 1 foot off the ground. My fences aren't like that now, but are in serious need of rebuilding and I would definitely do it that way next time. And lastly, good luck! Fencing is hard work, but it is worth it to go the extra mile and measure it out. Make sure all your posts are straight and even, and you'll have a fence that lasts a good while.