Use Hardware Cloth, Not Chicken Wire

Solution

Cover all coop and run openings (windows, vents, perimeter) with 1/2-inch or 1/4-inch hardware cloth.

Explanation

Chicken wire is designed to keep chickens in, not predators out. Raccoons can reach through it, and larger predators can tear it. Hardware cloth is a sturdy wire mesh that prevents entry by most predators, including small ones like weasels.

Notes

Secure hardware cloth with screws and washers, not just staples, as determined predators can pry staples loose.