Never restrict your dog in the crate for longer than 5 hours. (platpets.com)
It is important to never leave the dog in its crate for long periods of time, as this will confuse the dog and force it to soil its sleeping area. (dogbreedz.com)
Since puppies are more likely to chew on and potentially swallow anything you put in the crate with them, safety comes first here. (animalso.com)