OntairoGreys: please let me thank you again for the information that you sent me - it was very informative.
I did send the vet you suggested an email explaining everything that had happened & he responded back to me & although he wasn't able to explain why it happened - was able to helped ease my mind some. I realize that I'll never know why my angel was taken so young - at least I know that I did everything that I could for him.
Thank you again!!