Can bravery be improved? In other words... If my horse is a big chicken...am I stuck with it or will more training and exploring improve him (like in real life).

Training in a round pen will help them spook less.

Procyon Ponies said:
Training in a round pen will help them spook less.

But will a sub-par ever improve to Superior or better?

No. A horse's ratings never change once it's born.

You would think with round pen training, they would be able to "level up" and gain courage and improve their rating. I know that the breed ratings never change... but why bother "training" something (bravery) if it can't be improved?