Please choose the correct ending to complete the given sentence: Pets and Animals: [header] How to prevent your dog from becoming carsick [title] Interact with your dog around the outside of the vehicle. [step] Keep them on a leash for safety. Let them smell around the vehicle.

Ending1: [substeps] Outside, drive with your dog so that they know you are there, and pay attention to their leash movements. If your dog gets overly nervous around your car, sometimes they will pull their leash away from you to avoid behavioral changes, like leaning in the car or jumping out. Ending2: This will help them see it as a safe, welcoming place. Take it slow and be patient-your dog may be afraid of the car, so don't force it if they seem uneasy. Ending3: If you don't have a leash they can go outside. [substeps] Get your dog excited to be walked. Ending4: Roll in the bottom of the car and call the dog over to you. If your dog won't investigate under the front wheel, let them run around the front as far as they can before politely pulling over.

Answer format: ending1/ending2/ending3/ending4