This is so sad for you and your family. I lost two of my 5 hens last spring to a raccoon that sliced through a pretty sturdy screen (now hard cloth of course); luckily our dog heard it and chased it away so it only got the two. It left the ladies, too, and when I picked them up there was an egg under them, like they were protecting it. Of course they were my two favorite hens, Pinta who loved to pick beetles off the asparagus with me, and Nina, my beautiful red-head Americauna. I still miss them. I hope you have a neighborhood forum (on the internet) where you can post what happened so others can watch for the horrible, thieving, killing dog(s), and where you can ask if anybody has any extra chickens they might give you. It will be lonely without them. Best of luck to you.