You may have to section off a portion of the crate until the dog grows into it. Some puppies will use the extra space as the restroom. They are easy to clean, last a long time and are airline approved for shipping. They are more closed in and don't offer as much 'ventilation' as Wire Crates. These crates offer a better view and air circulation.
Wires are available with a variety of epoxy, powder, anodized coatings.
Folding models are preferred by many exhibitors for traveling to shows. Not recommended for extremely long-haired breeds. D-Flite These are usually used by handlers needing an air approved crate that is combined with grooming table. They are very sturdy and are very expensive. You can obtain them through online dog supply sites,show catalogs or at shows.