I know this feeling to well. I am so sorry for what you are going through. Just give it one day at a time. It will always hurt some but does get a little easier in time. Lots of prayers and hugs sent to you.
I am so sorry for your loss. Yes it sounds like a dog attack. Back in Oct we had a dog break into our coop and kill 12 of my hens. It will be back. I say SSS. The one that got mine got away that morning and than came back that night. He will not kill anyone elses. He only broke their necks...