I used hardware cloth, heavy-duty, and lined it under the run and 1 ft around the outside and 2 ft up on the chicken wiring for extra protection... we've only just gotten a few rats and a squirrel so I really hope they go away I know it's crazy but go to your local or your hair salon or pet care place and ask them for hair. It's kept everything away since we've had my chickens hope this helps and ill be praying for ur problem GOOD LUCK!!! ALSO, pee smell like a dogs pee even urs if it helps lol its cray but my chickens are fine ( ish)