Giant dog breeds like Great Danes require special giant dog crates. A giant dog crate is much larger and heavier than a crate for any other dog. Crates for giant dogs can weigh 70 pounds, not including the dog!
The good news is that a giant dog crate can come in collapsible designs that store flat in a few minutes and can be tucked away out of sight. The bad news is that these crates can be pretty expensive. Expect to spend an easy $200 or more for a good quality, collapsible giant dog crate.