Horses and Goats are good companions i have both. My paddock (1 acre) is surrounded by field fence and a electric ribbon around the inside top. Started out with solar power for fence charger but after replacing it twice before either was a year old I swiched to a higher powered charger that works off household power. I should have run an extra hot wire lower to the ground for the goat. He used to stick his head through to get outside vegations (roundup cured that), but now he uses the fence for scratching and the fence is bowed to the outside all the way around.
When the goat was younger I had to remove his head from the fence several times because his horns would get hung up. One day I heard him bellowing and when I went to investagate I saw him with his head stuck through the field fence and the horse had a grip on his back, with his teeth, trying to pull the goat out of the fence. The horse had all four of the goats legs off the ground. Don't know if the goat was bellowing because of being stuck or because the horse was trying to unstick him. You know, come to think about it, I don't think the goat ever stuck his head through the fence again.
Oh yeah, the field fence helps keep stray dogs out. Two dogs, one belonging to my non responsible nieghbor that was asked to keep control of his dogs, have crawed under the gate to chase either the horse or goat. My horse hates dogs and doesn't run from them but attacks them instead. Twice I have pulled dead dogs out of the horses area.