Abused Train How Do You Train A Grown Dachshund That Was Abused Before You Got Them?

How do you train a grown dachshund that was abused before you got them? - abused train

Can say I took a dachshund from a rescue and was in the past not misused. They said it was the training in the workplace and for the most part. But he developed the habit of going home. We have at the same time every day at the same time feeding per day. His routine is the same. It is available at the house for approximately 15 min. before it planned to release. What can I do to help the train?