I would like to thank all for their support although I wold say that there is a very distinct difference between having to euthanize a beloved pet to put them out of their misery (which I have had to do) and having a pet sit in a kennel, isolated without human touch or affection. To not understand where their human is and why they are all alone. To be terrified of so much of this world and not be able to understand. This has taught me that there are two kinds of people in the world: Empathic humans who feel for people and those who should never be allowed to have another pet.

You have small kids, I understand. I'm sorry it happened like that.
I can only speak for myself, if my kids were still small & in the home, I'd have done the same as you.
Today, the kids are grown & gone & my new fur baby, when I 1st got him, bit the living crap out of me, drew blood & it bled for days. It was my fault.
It was an accident, he appeared immediately apologetic afterward. It hasn't happened since & he remains the love of my life, my best friend & companion.
You can't put your family in danger. I get it. I'm sorry again.

I seriously feel your pain. I recently had to euthanize my cat that was about 22 years old. I have always had at least one animal in my house since
my early twenties so it is very very quiet around here and kinda lonely.

She broke skin, in my dads house that would = murdered dog.
Sorry.
I give cats a bigger pass on this then I do dogs due to their vastly differing nature.

No one should feel obligated to keep a dog that bites the hand that feeds.

If you made no effort to take her to obedience training to help to motivate her anti social behavior, I personally would feel guilty of the my commitment to that end of not trying!!!

Some pets can not adjust to new surroundings or individuals, most will accept their new surroundings after a while, after six months something in her surroundings with you were not reassuring.

Since you have had other animals, your actions proved to be the best solution to your problems with her!!!

Some dogs have had just too many bad life experiences to be saved...i had my little Tobey for just one week and he was so fun & so sweet, then for no reason, no warning, Savaged my hand, the other one got damaged too as i tried to pry it from his jaws.
And he was So sorry afterwards, but So sadly obviously awaiting retribution as well.
I tried as hard as i could (and i am nothing if not a McGyver) to figure how i could keep him and yet keep visitors and neighbors safe....
when the vet did that thing (the Rescue i got him from refused to take him back, bastards!!!!) i cried & cried, and the vet comforted me by saying "You have released him from a very scary (to him) world"....one week together and i remember him all the time...hugs to you & him......

You did the right thing for you, even though you feel sad and a bit guilty. You did the right thing. Take care.

I hope you returned her to a no-kill shelter. If that's the case you have nothing to be upset about. Perhaps she'll find a home that is a better fit.