I don't think the smell of a gas operated 4 wheeler represents danger. They've never attack a deer. The smell of a human is the danger they're looking for. I hunt with my Service Dog at my side. Once I was sitting in a chair overlooking a valley. At some point I realized my dog wasn't looking at me, she was looking over my shoulder. I looked over my shoulder to find a doe was there eating away. It saw my Dog and didn't care. When it realized I was there it left. Now I hope I've taught her to let me know when she sees one. [&:]