So sorry for your loss...I feel your pain!!
I started raising chickens in a very residential neighborhood when I was 14 years old.
Had no idea about hardware cloth, built my pen with chicken wire.
I came home from school one day to see a bunch of my neighbors all excited on my front lawn.
There, in the middle, was one of the neighbors 75 pound dog with my rooster in its mouth, the rooster was still alive. No police were called.
I tackled the dog, fists flying...
We went a few rounds, me landing several good body shots, but the dog would not release my bird.
I positioned a choke hold.
He dropped the bird.
I wouldn't let go...the dog went limp...
Mom finally pulled me off while I was still beating the unresponsive dog.
Neighbors now starring in complete disbelief...blood everywhere, rooster, mine, and dog.
I carried away my now dead rooster.
Neighbor took her unconscious dog to vet.
Mom took me to the hospital.
That evening, my neighbor had a dog with broken ribs, and huge vet bill.
I had 8 stitches, a dead rooster, and apology with an offer to compensate.
Not to mention complete respect / fear from the neighbors.
Good neighbor, bad coop design. Lesson learned.
My current coop is built to keep a 200 pound dog out, I'm too old to fight mother nature.