If it's too big, your dog will have space to use the bathroom in the crate and still have a clean area. It should be big enough for your dog to sit up, stand up, lay down, and turn around, but no bigger.
[header] How to housebreak a dog using a crate [title] Pick a crate that is the right size. [step] A crate should be just big enough for your dog. If it's too small, your dog will be uncomfortable.