Nice place...but you have a problem. Dogs are extremely wary and usually circle checking the wind if they have cover available to do so. Your layout plays into Mr. Fox's paws. However he has developed a pattern and in that pattern is confidence along with a familiarity to human scent. So, replicate that pattern(location and time) to remove wariness.
So, here are my pelt crawling thoughts: I can't remember, but do you have the remote teaser decoys that wobbles/wiggles around? If not get one, then I would get the girls to gather up a bunch of chicken feathers and glue them onto the decoy. Build a ground blind within your comfortable accurate range. Set the decoy out and the hard part...waiting while remaining alert. When Mr. Fox shows up, I bet he moves in very quickly and attacks. As soon as he figures out he has been decoyed, he ain't going to be hanging around, so you have to be sending lead. I really think a 12ga shotgun with #1 or 2 pellets is a better choice in this scenario than a scoped rifle. Because, it's going to happen fast and if you are not behind the scope and ready, you are gonna miss the action. #1 or 2 at 50 yards throws a pretty effective pattern and a semi auto with the plug removed gives you 4-5 chances to put him down.
Sorry, but I am still picturing you as Bill Murray in fatigues, a jungle hat and that off center lower lip saying: " I smell varmint poontang. And the only good varmint poontang is dead varmint poontang, I think. ":laughing:
I wish I was closer...but I am allergic to I95........