Adult dogs and cats easily make it through the night without having to relieve themselves, so your pet should also be OK on most very long flights. Regardless, you'll have to line their carrier with something absorbent – a Dry Fur pad works nicely under your pet's own crate pad or thin blanket.
Do dogs get traumatized by flying?
Some dogs may experience trauma or anxiety after a flight, particularly if they had a negative experience. It's important to monitor your dog's behavior and health after the flight and seek veterinary care if necessary.