However, don't depend on crates as puppy-sitters for extended lengths of time while you're at home. A crate should be slightly longer than the dog. For puppies, either purchase a small crate and plan to buy another when the dog grows larger, or purchase a large crate that will be just right when your pup matures. Also buy a crate divider that you can insert to adjust to your pup's current size.
Some owners purchase plastic carrier-type crates.
Most of these manufacturers don't offer dividers, so build your own. But think first. A makeshift cardboard divider will probably turn into puppy lunch. You can use a crate to help housebreak a pup. If a puppy is physically able to avoid it, it will rarely soil where it sleeps.