A horse fence can be as simple as you like. You are unlikely to have to worry about your horses jumping over the fence. The horse fence is there primarily to keep your horses from wandering off.
On most farms a horse fence is mainly just a split rail fence. The split rail fence works great for a horse fence, giving the horse the feeling of freedom, without the worry of him getting out.
Why Use a Split Rail Fence For A Horse Fence?
The horse fence you install should be open and allow the horses to look over and feel as though they are not locked in. Horses can become depressed in captivity and the feeling of being locked in may cause them to react poorly.
The split rail fence is a great horse fence for this reason. Your horse can look over and even through the slats of the horse fence, making it feel as though it is not locked down.