Sad devastation

Last night I did the normal routine. Watered the garden and planters boxes. Went out and scattered scratch for our 36 chickens. I say "here cluck clucks" just like on Cinderella my girls love that. They also love to grab a hand full of grass and watch them hurry to eat some. Then I
check to make sure they have enough water and feed and then go inside to feed my kids and get to bed.
Well....
Sad Devastation is nearly and understatement! This morning when we went to toss scratch out for the chickens...
the chickens are Dead, (save one and the 2 silkies we keep separate because the Cochin rooster pecked them terribly). It was like a bad movie where everyone drops dead in there tracks. I didn't want to show you the horror so the picture above isn't of my flock. We saw dog tracks in the garden and the Silkies pen was turned over with the side dented in. But only 3 of the over 30 dead chickens were visibly wounded. I think there was predator, but to rule out disease we took 2 of them to CSU to be tested. I keep wishing they were still alive. It is heart breaking. No eggs... not even alive long enough to fulfill the measure of their creation. Major bummer... boo hoo hooooo
UPDATE:
CSU informed us that the chickens died from a disease. The dog got to them after they were dead. Unfortunately the last 3 also died the next few days later. Major bummer. Sigh....