Loose barbed wire and young horses.

This is one of a series of several photos, with this young foal mouthing and "playing" with the loose barbed wire fence.

It makes me cringe. Every time.

Any horse—but especially the young or nervous—can crash into barbed wire and severely lacerate their skin, ripping flesh to the bone.

Permanent scarring and disabilities are common, and injuries may result in the horse being humanely destroyed.

Chain link fence.

This type of fence, chain link or cyclone fence, CAN be a safe and suitable horse fence, but it would require the use of both top and bottom supports that are sturdy enough to withstand 1,200 pounds of abuse.

A simple tension wire will not do, as you can see by the damage to the top of the fence in this photo.

(Sunblock might not be a bad idea, either.)

Low wood rail fence.

As much as I prefer wood fences to most other types, this fence is not tall enough for the size of the horses kept inside.

The top plank should be higher than the point where the horses' neck and chest meet, at minimum.

I like to see them higher, so that the horse has to LIFT its head to put it over the top rail. That way, if they push against it, they cannot throw their full weight into it like they could if it were chest-level.

Barbed wire and nylon halters.

Halter doesn't fit, and could easily get hung up on a barb. Right at eye level, too.

Nylon is not recommended for a turnout halter because it tends not to break in an emergency, but this one looks old enough that it might break if he stopped walking and you didn't.

Barbed wire: not intended for pets.

The grass is definitely greener on the other side of the fence.

If this mini spooked and threw her head up, she could become ensnared in the wire and horribly maimed. Not worth the risk.

Fraying nylon halters can also easily get caught on the barbs.