Dog 1 : I can empathize with you. I really feal for your loss (or impending loss) - but you will always have memories!! I lost my hunting partner 2 years ago and have never found another dog that could come close to him !! He was a gift(?) from my sister inlaw. When her husband died - they couldn't handle him - he turned out to be one of the best lab retrievers in our area - and my best buddy.
Some day you will be surprised - another one will come along with basically the same traits - you will recognize them - and a new partnership will begin.

In the meantime - my sympathies!!

Gar