We are probably going to put in a false bottom on the brooder and add more hardware cloth. Plus get a night time game cam. I just cannot believe that this happened so close to my dogs and they heard nothing! I may even move the brooder into the back section of my rooster run that has never been used .
What I don't understand is why my birds in the coop and large runs have not these problems. We used 2x4 welded wire on our runs and our coops do not get locked up at night and most of our birds don't sleep in the coop!