Fencing- To accomplish that goal safely, good fencing needs to present both a physical barrier---which is strong enough to contain a horse who runs into it or who applies pressure by leaning or reaching through it---and a psychological barrier, so the horses can see it, always know it’s there and not continually test its limits. But good fencing must also strike a balance---if it’s too “strong” it may entrap or injure horses. Too weak, and it may allow horses to escape.