With an adult dog I got that wasn't crate trained I did "crate drills" with him. I put toys/treats in the back of the crate and used the crate command while pointing. The dog goes in the crate and gets a prize then he can come back out. I also put toys in there sometimes and let him work on the toy in the crate. For the first couple of weeks I had him, all of his meals were eaten in the crate. I've heard some people will put the toys just inside the door, but close the door so the dog can see the toy, but can't get in. The crate then becomes this place that the dog really, really wants to go into.