BBB - I saw this thread this morning but couldn't bring myself to read it. Now I have. I'm so sad for your loss. Dogs that kill dogs aren't right in the head. Our Chloe bear's mother was attacked by a pig dog as a pup, even though she went straight into the submissive posture (exposing her belly and ending up with enormous stomach wounds).
I'm angry and sad. Wish I could say something healing about your dominion.