Killing your dog is a hard thing to do. A couple months ago, my neighbor took in a bull mastiff that had only bit a couple of people. Then he bit a couple more kids who were teasing him. Then he mauled a beautiful seven year old girl and she needed 257 stitches in her face and she will always wear this scar. This all happened because they just wanted to do the nice thing. He was such a pretty dog too. There are so many good dogs and puppies who need a home. I'm sorry about your dog, I hope this doesn't happen to you.