How large of a corral? What materials are you building it out of? If you are using electric tape to keep predators out, place it on the outside. I think it's very helpful for keeping dogs out. The only wild animal that I am ever concerned about bothering adult full size horses in our area is a cougar. The bears never bother them. Not sure how effective the top strand is for cougars since by the time they hit it they would already be coming over the top of the fence. My neighbor's goat was killed by a cougar that managed to get over her 5' fence with hot wire on top. OTOH, their chicken coop is surrounded by hot wire and in 5+ years the chickens have been safe, even though we have raccoons, foxes, bears, and coyotes in addition to the occasional cougar wandering through the neighborhood.
Never underestimate how effective a donkey can be at protecting your other animals. A friend's diminutive donkey beat the crap out of a cougar that attacked one of his goats.
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