Beyond a certain distance, and it isn't very far, 15-20 yards perhaps, an animal's hide becomes a uniform surface. There is no spot to pick, i.e., hair out of place, wrinkle in the skin, etc. It may be there, but most of us can't see it. That's why it's important to practice on blank surfaces and visualize a spot, be it an aspirin, orange ping-pong ball or whatever.