Make the crate a happy experience. When he goes in it, feed him treats, don't close the door, feed him the treats with the door open. When he gets used to that, you can feed him the treats with the door closed. Soon, when he gets used to that, you can leave, come back, feed him the treats, go away for longer, come back and feed him treats. Go longer distances and stay longer, and soon, he'll get so used to it, you can go away for a very long time. Hope I could help you!