Pets at flight?

You must take your pet’s health certificate. All airline companies ask for a health certificate.

Be sure to have the information about your pet and your contact information in your pet’s tag.

Your vet may suggest to give sedative medicine during the travel.
nvestigate about the airline company procedure. Many airline companies have peculiar procedures. The company may not allow you to take your pet to the cabin. If your pet travels in the cargo and stays there for a long time, you should ask for information about its feeding.

Take information about the standard measures of the voyager. Turkish Airlines allows you to take your pets under 7 kg to the cabin and the pets above 7 kg travel in the cargo. You bring the voyager and give its measures to the airline company at the reservation. This procedure does not change both in national and international flights.

As there are varieties among countries about the laws of taking pets in the countries you can learn the requirements from the Embassies.
http://www.thy.com/tr/en-INT/services/passenger_services/pets.aspx