I have heard it said many time that there is no such thing as a bombproof horse....and I actually agree. However, yesterday we were riding and there was a train approaching us about 50 yards to our right...whistle/horn blaring, there was a semi- truck approaching us on our left and at the same time, a low flying fighter jet crossed in front of us. You can imagine the noise and neither horse flinched. They are pretty close to being bombproof.