Originally Posted by Jibralta
I hope you don't go so far as to euthanize her. There are plenty of other options, like no-kill shelters and organizations that make it their mission to match a dog with the right owner. Having a bite history does not prevent her from having a happy home. I would consider adopting dog like that myself if I had the space.
It's typical of dogs to growl and bare their teeth when they feel threatened. But believe it or not, not all dogs behave this way. Some dogs are so timid that all they do is try to hide and get smaller in the face of perceived danger.
One thing that stands out to me is that she runs behind you when she sees adult men. She doesn't bark at them, bare her teeth, or growl. That says a lot to me about the way she communicates.
It's a quirk I've seen from time to time, across dog breeds big and small, and in dogs that have happy homes and friendly owners. It's uncommon, but it does happen.
You have to keep in mind that even the most cowardly animal will defend itself if it feels cornered. Dogs defend themselves by biting.