Past dogs and sadness

I had to look up a pic of one of my former dogs for a black lab post. I was fine until I saw him, now I'm a sobbing mess. This was over 10 years ago for this particular dog. Does this happen to anyone else? Every dog I've lost has been unexpectedly. That doesn't make it any easier. Sometimes, I think I can't do it anymore. My sweet dog I've got now is waiting for me. What are your thoughts?