I can relate to your story; as a kid our dog was also run over by a car. I remember hating my brother at that moment (he was taking the dog for a walk) and thinking a lot of "what-ifs". As you seem to do now. I know it's very easy to say when one isn't in the situation you're in; but: what-ifs are not going to help.
Anyway, good luck and my condoleances.
:-(.
