I can relate. Twice before, something has torn into my chicken wire pen, wiping my whole flock out once and most of it the second time. Last month, while I was out of town, it happened again. Whatever it was killed everything. Once, it was dogs, and they were caught in the pen. Still no idea what it was the other two times. I am giving up on the chicken wire coop, having it torn down, and building a new pen of reinforced hardware cloth that won't be so easy to tear into. I have an aviary made of it that nothing has gotten into, so I think it will be safe. Unfortunately, it is encumbent upon us to spend the money and make the effort to make predator proof pens.