Is there anything on top of run?Tree in middle of chicken pen that coons came down. Place in fence where they dug under buried fence.
Have a few clever and effective ways to wrap metal mesh around a run tree.
Good examples of anti-dig apron installation.
If rodents are prolific, burying the apron ~12" would be good.
https://www.backyardchickens.com/threads/wire-around-coop.1110498/#post-17093528
https://www.backyardchickens.com/threads/new-coop-project.1169916/page-2#post-18481208