Add hot wires. I've got a resident momma black bear that lives in the woods behind my house. I've never had a problem with her getting to my coop through the electrified poultry netting.
Every opening in my coop and run are covered with 1/2" hardware cloth attached with 3/4" poultry staples. I have about a 2' predator apron all the way around the entire works.
The entire setup sits inside a 1/3 acre pen surrounded by poultry netting powered with a 10,000 volt charger. No ground...