Cat cat is traveling on the flight, so what are the proof of having to go to get health documents?
Different countries have different laws regarding this. The answer depends on which country is at its destination, what country are starting their trips, and, where appropriate, countries you are in. If changing planes at least tell us if you're flying within the U.S. or from England to Canada or Australia to New Zealand, or what … then someone will be able to give a precise answer.
