i traveled the world with as many as five dogs at a time. You do it by getting whatever health documents the destination requires, booking the critters as either excess luggage or (actually better and safer) sending them separately as air cargo.I never had a dog small enough to carry on board, but did that with a cat (to his dismay) more than once. And never had a dog lost, hurt, or even much inconvenienced by the process, however far the flights, including transit overnights.Mabel sighs, u201cHere we go again.u201d