Please choose the correct ending to complete the given sentence: Pets and Animals: [header] How to go on a car trip with a small dog [title] Get your vet's clearance. [step] Before taking your dog on a road trip, you should make sure your pet has a clean bill of health. Some dogs have health problems, while others may simply be getting up in age.

Ending1: That may not automatically disqualify your dog from travel plans, but it's still best to have your vet do a thorough checkup. [substeps] While you're at the vet's office, ask your veterinarian for a copy of your dog's vaccinations and medical records. Ending2: [substeps] In order to ensure your dog is not carrying extra weight, have her checked by a vet to make sure your canine health is under control before going. If your dog doesn't have one, she could be suffering from an infection. Ending3: For instance, one may have sickle cell anemia and have oily skin, like chihuahuas, who shed more often. [substeps] Your veterinarian will be able to help you decide how old your dog should be. Ending4: Make sure you consider the need for a prescription from your vet if your dog is unsure of dosage or seems sick. Your vet can also tell you what your dog should avoid when traveling.

Answer format: ending1/ending2/ending3/ending4