Abstract: A protector worn on a horse leg includes a first piece and a second piece located above the first piece. The second piece is connected to the first piece via a first connecting portion so that the second piece is movable relative to the first piece. A first gap is formed between the first piece and the second piece. A size of the first gap becomes smaller when the horse leg is straightened and becomes larger when the horse leg is bent. Both the first piece and the second piece fit on the horse leg all the time when running, not disturbing the movement and relieving discomfort of the horse.