I’m so sorry, that’s devastating. My brother’s flock got completely taken out by a weasel. They can easily fit through chain link. Another time it was a skunk that dug underneath. My dad built a coop with chicken wire covering the floor 4” under ground for that very reason, and hardware cloth on the coop openings so even if something tears open the run, it still can’t get in the coop. Hasn’t lost a chicken yet.