Written instructions for food and water must accompany all animals shipped regardless of the scheduled time in transit. Animals may not be exposed to temperatures less than 45F unless they are accompanied by a certificate signed by a veterinarian stating that they are acclimated to lower temperatures. Animals cannot be shipped COD unless the shipper guarantees the return freight should the animals be refused at destination. Because each airline establishes its own policy, it is important to check with the air carrier you intend to use. However, the following are some provisions you will likely encounter at most airlines.
Airlines generally require health certificates from all shippers.
So it's a good idea to have a licensed veterinarian examine animals within ten days prior to shipment and issue a certificate stating that the animal is in good health. A pet may be transported as baggage if accompanied on the same flight to the same destination. Pets may be shipped as cargo if unaccompanied, and many airline cargo departments employ specialists in the movement of animals. Animals must always be shipped in pressurized holds. Some airlines allow the kennel to be carried in the passenger cabin as carry-on luggage if it fits under the seat.