Pit bulls are more likely to bite and when they do, they hold the bite much longer than basically any other dog breed and they often require outside intervention to stop the second bite.

Once the dog has demonstrated itself to be dangerous, there is not much you can do other than euthanasia. The worst thing you can do is bring it to a shelter and let an unsuspecting family take the dangerous dog in. A lot of trouble would be saved by choosing a similar looking dog breed that isn't as aggressive or dangerous.