We have an 8 week old puppy, the first night she stayed in her crate no problem. We have the crate supplied with chew toys, bed, heating pad, clock for ticking sound, etc... since night 2 she cries all night in the crate. We followed the ideas of no food or water before bed, she went out to potty before bed, didn't want to potty until early in the morning, she just won't sleep in the crate at night, although she will during the day.