Well, my friend tried once. The owners moved and the cat was left because the owners couldn't take it. Which, was bad enough. They barley cared about the cat though. He only came into there house to eat. It worked out okay. He is still bad with strangers but LOVES her and her family. Barley is his name. It may take a long time and if the cat is really feral then the shelter will probably put it to sleep. Shelters don't have the time or money to spend on pets that can't be well tamed. Good LUCK!