I'm so very sorry to hear all this, Fuzzybird.
How HORRIBLE. I have lost birds to my dog twice over the years and it's the worst.
The last time it was my lovely, blind, girl, Flash. She must have been following me/my voice and entered the main yard.
I never saw her do this. She probably got lost. I was in the main garden/chicken area, when I heard her call out..........I ran over, thinking she was just hurt.......but the dog had broken her neck. I cried and cried with her in my arms for a long time. It broke my heart and I STILL (going on three months later) feel horrible about it. It was my fault, as I was dealing with the new baby chicks and never saw Flash. Gosh, I want to cry again just writing this. My heart goes out to you. I am so, so, sorry!!!!!!!!!!!