Ditto. Although I can't think of any reason for putting my dog (if I had a dog) on a flight.

If I was moving and had a dog, I would drive one of our cars loaded with stuff and the dog to the new city while my wife flew or drove the other car if feasible.

If I absolutely had to take a dog on a flight, I would make sure the dog was "empty" (not feed it the night before and day of) and also possibly get a pill from a vet to keep it calm/sedated.

Either way, being on a flight must be so stressful for a dog.