Oh my gosh, I am so incredibly sorry! This is one of my biggest fears with my dogs and cats! You just never know what exactly they are thinking, and why they do the things they do. Sometimes there are signs, but other times there simply arent! I agree with everyone here - all you did was try to give a wonderful, loving home to these 2 dogs. Nothing you could have done differently would have prevented this from happening. It will take time, but please try to accept this as a *dog thing* and not a *what if I had...instead...* thing. Sending hugs and prayers across the miles.