For animals that travel in and out of the country. Like pets, race horses, zoo animals etc. They get examined by vets, and animal carers take care of the animals while they wait for flights.
A lot of times animals that come from out of the country go through JFK and have to spend days in quarantine. This makes the experience less tramatic especially for horses since the nearest facility for them was over an hour away. It caused the horses a lot more anxiety than they already had from the flight.
(Please treat the people who pay their money to go there better.)