The stray dogs came back into my yard, and they came so fast my other chickens didn't even freak out. I was making dinner, when my husband came home and asked if I had heard anything. After some investigating, we saw they had our second free-roam rooster (as we hadn't seen any signs of the strays in a week). They were eating him.
My husband posted about it on our neighborhood Facebook page, and now ladies are re afraid to walk their little dogs, because my husband confirmed that one of the strays was a full-sized German shepherd.
We're borrowing my mom's sheep dog, maybe permanently. She doesn't eat chickens, doesn't eat eggs, and she's very calm. My neighbor also confirmed to my husband that they saw the pack of dogs, and, embarrassingly, that they heard my shouting the day of the first attack.