Sagging woven wire with uncapped T-posts.

This may be one instance where the barbed wire is actually HELPING this fence to be 1% safer, but this is still an accident waiting to happen.

If the openings in a fence are large enough to allow a hoof to pass through, even the laziest horse can become stuck by a stray kick at a bothersome fly.

Fence that is not tight, sags and has broken in places adds immeasurably to the risk. If the fence were tighter and a hoof went through, the horse might be able to pull it back out, BUT if the fence "gives" because it is not tight, it is more likely to become entangled.

T-posts without protective caps can impale a frightened, fleeing horse.