I really struggled with crate training Charlie as he was rescued from a very poor situation where he was locked in a crate/cage for vvery long periods of time so he saw it as a very negative place to be put!
But with help rom my little super star Rubestar!!! We got there in the end. I got an extra large crate so it wasn't as small and confined and one that they would both fit in! Ruby was trained in a crate from 8 weeks old so she thinks of it like home!
It took a long time- nearly 3 months for him to be happy in there on his own, but as Karlin said- a crate trained dog is so much more versatile.
When a dog is left at the vets for instance- they are put in a crate!! When they stay at my parents for a night, they sleep in a crate downstairs and are very happy. Not a sound from either of them!
They have a crate in the car for travelling in.