I had a hard time choosing the right sized crate for Brody. When we got him, he was only 7 months old, and since we only knew he was a BC mix, and not what his other breed was I wasn't sure if he would get any bigger. My brother used to have a Leonberger, one of those giant breeds, and had a crate he didn't need, so I borrowed that from him. Brody would get lost inside it. Honestly, you could fit 4 Border Collies in there! It took up so much space and couldn't be moved without taking it apart. I finally got him one that fits him much better, but it is for medium sized dogs, not large. It is plenty long enough for him to turn around and lie down, but when he sits, he has to lower his head. I don't really mind that much since I only want him to use it for quiet times and night time, so it encourages him to lie down. If I was to get the large one, it would not only be taller, but longer and then it would take up so much more space.