Change your thinking
You can do nothing (presumably) about the Gun Dogs other than anticipate their effect. Use that to an advantage. Blocking routes, human/canine 'screens', etc.
Think long term here. Move your stand closer to where you can shoot him in legal light. Use your trail cams to pinpoint his movement pattern closer to where the does are right now. Feed and water sources, pressure from other hunters, human intervention and wild predators will affect movement patterns but your trail cams will spell the difference. Use that tool smart and you may have a shot at this good looking deer OR maybe the imposter if he exists.