Sweetie, please don't beat yourself up...if the puppy had a choice of where to die, don't you think he was in his favorite place? I know your grief, please don't torture yourself with guilt on top of everything else. it's not your fault puppy died, okay?
Tell you what, I still talk to my dog Misty all of the time and she's been dead for years...her spirit is forever in my heart, I loved her so.
Of course you are in my prayers, you and your family.
Love and hugs,