I really feel sorry for Mr. Biggles...I realize that points made that you can't rehome him, etc, etc, but it doesn't seem like you tried any kind of behavior modification with him, or talked to your vet (which I see people mentioning, yet I haven't her King2005 say anything about- but maybe the story will change later).

I don't see why Chad owns dogs if he will die from a dog bite- that doesn't make sense. It also doesn't make sense that you chose to hide the first bite from him if he could die over it...if that's the case, YOU were putting his life at risk then. And, now that it has become more serious Mr. Biggles is the one to suffer.