I'm just looking at our new boy, 9 week old puppy. Asleep in his crate, blanket over it, door open, flat out snoring, wrapped in his 'blanky' He smells a bit, the change of food is making him fart, it seems!
He is in no way anxious, he is quite a character already. 4 days with us and he has the run of downstairs. Crate in living room with us, food in kitchen, toilet in the conservatory, by the back door. We'll add the garden to his area when he is older, and it stops raining!
4 days!! and he drags his blanky from wherever it was abandoned and wraps himself up in it, in the crate. He was not crated before we got him. If it is so unnatural, cruel or lazy of us, etc, then why have we not had to train him to use it? We just popped him in there the first night we got him. I sleep in here and let him out for a small hours loo break. He hasn't cried, fought the bars, tried to get out etc.
The only time we close the door is when we need to leave the room. So eventually he will be locked in over night without me in the room, 10 pm - 5am. Given that dogs hat are appropriately exercised (walked or chew trained) sleep for up to 16 hours a day it doesn't seem cruel to give them somewhere that is their own space to spend that time in.
Apologies... I had to stop as he woke up, headed for the loo and has headed back in with his chew toy!