How so very tragic.
I hope that the owner of the other dog takes responsibility and helps you financially. Also, I hope that you reported this unfortunate event as no doubt this will happen to another dog, cat and heaven forbid...a child.
This owner should be strapped with a fine for letting his/her dog unattended. I cannot imagine the horror that your husband went through and of course your little one.
LOTS, no...TONS of pawsitive vibes coming your way.