If your within 50 feet he'll either smell, or hear you. Do much more than breath, and the little demons can pick up on both. Their eye sight is good enough that he's likely to see you easier than you think.
They can be a real challenge! But then I was sitting at the base of a tree eating beef jerky one deer season and a red fox ran in through the underbrush so fast he actually stepped in my lap before either of us knew what happened! He kept running on past, and I about crapped my pants! Teriaky seems to be a favorite flavor!
