I have experienced your pain. I was about 18 when my parents had to have the family dog put down. I don't know whats worse though, that or what happened to me a few years ago. I came home from work one day and my Akita that I had for 9 years was missing from the yard. I have never seen her since. I'd like to think that some family has/had her and at least loves her as much as I did but I can't help but think of all the bad things that could have happened to her too. I still catch myself looking through petfinder every now and then hoping she'll pop up in a shelter or something but I know the odds are astronomical. By now she would have probably succomed to old age anyway but I still hope.
Sorry for hijacking your thread BLINGN but it your story brings back memories both good and bad. I'm gonna go look through petfinder once again.