I couldn't reply at that time, it was too hard. Everytime I read about a big dog attacking a yorkie, I see my little Angel on her last day, and it makes me weep.
I am so sorry for your loss. I know how you feel. It's awful. I felt so guilty, like it was my fault and there must have been something I could have done to prevent it, it all happened so fast... But I have come to terms with the idea that it was just "her time", and hopefully you will someday too.
Take care of yourself through this difficult time. I am so very sorry.