Please choose the correct ending to complete the given sentence: Sports and Fitness: [header] How to deal with severe motion sickness in dogs [title] Use sedatives to calm your dog on long car rides. [step] These medications work by interrupting your dog's stress and pain response between the brain and nervous system. They reduce stress and relax your dog for several hours.

Ending1: Make sure your dog is receiving the right medication for his specific needs. [substeps] For example, create a topical beta acid cream and administer it before taking your car ride if your dog is sick. Ending2: These products may even allow your dog to sleep peacefully. Always consult a veterinarian and get a prescription before giving your dog a sedative. Ending3: [substeps] Learn how to use sedatives. Usually, you'll be instructed to make an appointment with your veterinarian before taking sedatives. Ending4: [substeps] Sedatives not only help suppress the neurotransmitters within your dog's brain, it also regulates your dog's heartbeat. [title] Get your dog to avoid rolling forward or backward.

Answer format: ending1/ending2/ending3/ending4