I had the same thing happen, only it was my boxer who we had put to sleep on November 8th. My son who will be 4 was with us when we had it done, I did not let him watch, but he saw our dog was suffering and understood as much as a 4 year old can. We explained to him that Ginger was going to be in dog heaven and would't be in pain anymore. He knows that Ginger is gone, so we went out yesterday a got him a new boxer puppy, so he could grow up with. It truly was one of the hardest things we had to go through. I feel your pain. Good luck with everything, I know things will get better with time.