Thank you! Very good information!the wire burying folks are talking about is called a "predator apron" if you want to google for some tutorials and a better explanation - in short you're laying hardware cloth horizontally all the way around the run/coop so that animals that like to dig will hit the wire and be deterred. They might work their way down the fence in either direction but they never think "I should back up 2 feet and try again"
You may also need to cover the top of the run with hardware cloth as well as a lot of predators are good climbers, and it will ultimately keep them safe from aerial attacks as well.
For the coop, all windows and vents should be covered securely with hardware cloth as well. Do periodic checks for large gaps, cracks, loose boards or doors that dont stay secure, etc.