When crate training your dog, it's important to provide them with just enough space for them to comfortably stand up, lay down and turn around. By purchasing a divider panel, you can buy a larger crate that your dog will grow into, but will also allow you to "shrink" and "expand" that extra space as your dog grows. Some crates come with an included divider panel, but for those that don't, here are some which can be purchased separately.