Great story. Odds are the rotti expecially was sadly probably dumped. It is so heartbreaking.
Sorry little off topic. I remember once, my supervisor was out on the road. Got a call about a cat on the side of the road. The person didn't know if the cat was injured or not. My supervisor later back at the shelter, said that he pulled up, saw the cat and started to walk up too it and realized that it was actually two cats hundled together. He said they didn't try to run, just too scared. He said that knew that they were dumped.
But yes, animals do form bonds with each other. anyone remember the video of the dog that was hit on the highway and you see a stray dog run in the middle of the highway and is seen trying to pull him off the road. Maybe someone can post it here?