Dear Coffee House Girl, my eyes filled with tears reading your post. I know exactly how you feel, I was with our Golden when he had to be put to sleep and it broke my heart in two. The pain was unbearable. He was nearly 14 years old but we still affectionately called him our 'puppy' . As you say, they love us unconditionally and never judge us like humans. The whole family was inconsolable for a long time and my son couldn't work for a week he was so devastated, he just lay on his bed surrounded by puppy's toys and photos.The sight of my son grieving so badly made my pain even worse to bear.
It will take time to heal, and your lovely dog will always have a very special place in your heart, but you obviously have a lot of love to give to another lucky dog when you feel ready.
My heartfelt love and commiserations to all fellow doggy people on this board who know the pain of losing their best friend, or indeed the pain of losing any beloved pet whatever the species, they are all special.