God Bless you! Yes you are right, how very lucky and blessed we all are to have these special animals in our lives. Many people (who just don't get it) think greyhound people are nuts for allowing them to change our lives, well I can say that this breed has certainly changed my life forever and I wouldn't have it any other way.
It's so dam hard to loose a member of the family but we all know there will be a time when we are reunited with them, so until then continue to remember the wonderful times you and Prancer had together and let the guilt go, you gave him and he gave you unconditional love and now it's Prancer's turn to watch over you always.
Remember when you see that rainbow in the sky, Prancer is letting you know he is ok and will always be with you.
I would like to send my deepest sypmathies for your loss.
Prancer certainly was a special pupper!
Hugs!
Karen