Ok, I don't know dogs very well, but I see dogs at the humane Society that are elderly, and they get adopted and can live out a few more years with their new families.. I presume that there is some good times for them to make it worth the while of keeping them, and finding an adoptive family. Otherwise, wouldn't the Humane Society feel it more human to put them down?
Isn't it possible that this old dog, if placed into a loving family that has a basically similar lifestyle as Fort Firemen, can adjust and adapt?
I would not want anything to happen to my daughter, because even if the dog has amuzzle on, if it lunges and attempts to bite her, it could leave long lasting emotional scars. And, since a parent is programmed to protect their young, it would be very stressful to me to think of my child as always in some kind of danger.
(well, of course, they ARE always in danger, but the sound of an animal growling threateningly at my child turns me into a very protective tigress)