Please choose the correct ending to complete the given sentence: Computers and Electronics: [header] How to bring a dog into the united states [title] Make accommodations if you're flying. [step] The majority of people who travel internationally do so via airplane. If you're planning on flying, and want to bring your dog with you, there are a variety of considerations you need to make.

Ending1: Contact a airline who can help you make accommodations that will allow your canine to fly safely and comfortably with you. [title] Go through an x-ray at your veterinary or pet hospital. Ending2: [substeps] Your dog can travel in the cabin with you or underneath the airplane as cargo. Your pet is considered extra baggage and you will be charged according to the weight, including the pet's crate. Ending3: [substeps] You'll need to gather some clothes that will keep your dog comfortable. Consider what time of day you're leaving and when you'll be flying with your dog to ensure that it stays comfortable and can leave the airport freely. Ending4: [substeps] Try not to expose your dog to international drugs and other international customs issues. Planes may be crowded, and you'll be exposed to anything it might be allergic to or that can poison your dog.

Answer format: ending1/ending2/ending3/ending4