I agree with heldengebroed on much of his advice. When we moved our dog had to go cargo (PIA doesn't like dogs in the cabin

) I locked her cage with a luggage lock and taped the key to the top of the kennel along with copies of her papers (include microchip number) a bottle of water and a plastic baggy with dog food. Also fly direct flights if at all possible.
Make sure to tape down contact information to the kennel as well. Put names and numbers that can be reached locally at both your departure and arrival destinations.