I had the same problem with my dog penny when she was young as well. Your pup is still young, at this age they are still in the process of learning what you want them to do. Try putting puppy pads by the doors of your house, so that they get used to going to the door when they need to go out. If he is going in his crate try putting puppy pads inside and right outside of the crate door. Before putting your pup into the crate, take him out to potty. Also, it would probably be a good idea to take him/her out 30-45 minutes after eating. When your pup does go outside, reward him. Make your pup want to obey you because they love you, and not because they are scared of what will happen if they slip up. Good luck!