My chickens are dead.

I lost 2 birds about a month ago to natural causes, one died right in front of my eyes then the next day we found the other dead in the coop. The remaining 3 seemed happy enough and I was enjoying them tremendously. They were the 3 friendliest, most social of my birds. Well, we had a horriffic storm on Thurday and the backyard fence door must have blown in. Things were fine when I got up at 6 but later in the morning some feral dogs got into the yard then got into the coop and killed my 3 remaining birds. I am devastated.