Low, sagging barbed wire.

1. Not tall enough.
2. Barbed wire.
3. Loose and sagging.
4. Uncapped T-post.

Recipe for disaster.

Why risk it?

Diamond mesh fence.

When installed and maintained properly, this diamond mesh no-climb fence may be one of the safest horse fences, especially for foals and other youngsters.

Many of them advertise that horses simply "bounce off" if they run into it. I have not seen this fence in use locally for first-hand information, but I am inclined to believe that it runs toward the expensive side as it seems to be used less often than it should.

(Like welded wire 2 x 4 inch mesh fence, there should be a sturdy board or at least an electric wire at the top to prevent the horses from "riding" the fence down.)