I'm so sorry about Emerson. I just couldn't reply yesterday. I guess we'll never know why these things happen, but surely Emerson has a purpose at the Rainbow Bridge.
How do you tell another dog that his buddy isn't coming back??
That's so hard. A lot of extra attention and loving is all you can do.
I hope you at least find out 'why' Emerson died. Maybe it will help to understand. You'll be in my thoughts.{hugs}