Jeez :-(
I can't think of anything to say. I've lost a dog and a cat, but thankfully both were put to sleep and didn't really suffer in any way. I remember shortly after our dog went, my mum and dad were shopping and mum automatically started putting the dog food in the trolley. She was the most upset of all of us, yet she didn't really like dogs in general.
At least your dog didn't suffer this time or it would be a lot worse for your family, especially your dad.