Dogs in the wild will find either a cave or dig a small, secluded pit in the ground in which to sleep or just relax, away from the world. A crate will become your greyhound’s den – it will be seen as a safe place to be – it is a retreat from the world. It is a safe place to leave your greyhound when you are out, until they are housetrained and can be trusted not to destroy your home. Even after he is trained and trusted, you may find your greyhound curled up happily asleep in an open crate. The crate should never be used as punishment.