Even when hit, sometimes, the sign won't show up for a few yards down the trail. The blood has to start leeking out. I guarantee, that, if you hit it, it's bleeding somewhere. If you hit it and you're not finding blood, you're looking in the wrong spot. You just have to find it. A good hit in the vitals will always preoduce lots of bleeding. If you aren't confident of a good hit, don't shoot.