No blame placement here. I am so torn by your story in just the pain you must feel. Sometimes, whether it's with a dog or not, things happen in your life that aren't always in your full control. I can not imagine the memories and pain you must live with every day. You could have been more prepared for the situation if everything were disclosed from the beginning. That could have been your son on the other end and who would have been ultimately responsible then? I pray that you find peace in this situation and when the time is right a new dog will find you.
Hail Gunther 7-2-2013
If at first you don't succeed, destroy all evidence that you ever tried.
"Some people never end up going crazy...what a truly terrible life they must lead." - Unknown