 So if you pop your puppy in that crate, sit nearby so he doesn't get scared. He knows you're right there. Give him something good to do that's going to last a while. Then you've got 20 minutes of him having a really great time in the crate with the door shut. Now you've formed a positive association between the crate and the door shut and him being in there. And now you're on your way to eventually being able to step away and go away and