Angelfire, I have the utmost empathy for you...my entire flock of 30 birds were killed late on 4/30/10 and it was the same as you described - bodies everywhere as well as blood. Just last night after I thought I had secured a coop/run for my 4 EE's, I go out to lock the coop door and find only 2 of the 4 in the run! I then see a space below the front open. I look around and catch the neighbor's dog on top of my georgeous roo, Dorian!! I never did find the other hen, Sophia, but Dorian was about 100' from the coop, attempting to bring the dog(s?) away from the others. I am so sick of this!! I obviously have not yet comprehended the meaning of predator proof and will probably hire someone to do the job for me!
I feel your pain, but continue learning about and caring for birds/chicks. I eventually will learn the correct way to protect them but it breaks my heart to suffer them being killed due to my ignorance/negligence!!