All I can say is make sure it is at least one size larger than necessary. I got to the airport with my dog's crate, and they suggested I trade it for one of their larger ones, as the fines for flying internationally with a crate deemed too small are quite hefty. There was no charge for the trade up. My dog had a petmate crate, now it is an off-brand one, but worked just fine.
take measurements of your Dog from the tip of his nose to the base of his tail and from floor to top or head to tip of ears whichever is highest. This will assist you in the purchase of the correct sized kennel if you choose to purchase the kennel yourselves. When standing in the kennel your pet/s must be able to comfortably Stand, Sit, and Turn Around. Your pet's head Must Not be able to touch the top of the kennel (there should be 2-3 inches of head space from the top of kennel) and Must Not be longer than the kennel from head to tail in normal posture.
I am sure you knew this, but just in case! Good luck!