What is the spacing for 4 board horse fence?

1.Top Board: The top board of a 4-board horse fence is usually positioned at the top of the fence, providing additional height and stability. This board is often spaced 8 to 10 inches below the top of the fence posts.
2.Middle Boards: The two middle boards are typically evenly spaced between the top board and the bottom board. Their spacing can vary but is often in the range of 8 to 10 inches.
3.Bottom Board: The bottom board is positioned at the bottom of the fence and serves as a barrier to prevent horses from pushing or sticking their legs through the fence. Like the top board, it is often spaced 8 to 10 inches above the ground.

Keep in mind that these are general guidelines, and the actual spacing may be adjusted based on the specific needs of your horses and your local building codes. It's essential to ensure that the spacing is adequate to prevent horses from getting their heads, legs, or bodies caught in the fence while still providing a secure enclosure.
Additionally, the thickness and width of the boards should be chosen with the strength and durability of the fence in mind. Thicker and wider boards tend to be more robust and less likely to break or splinter, increasing the safety of the fence.