Please choose the correct ending to complete the given sentence: Pets and Animals: [header] How to travel by car with a fearful dog [title] Introduce your dog to the car. [step] If your dog is particularly fearful of cars or if it has never been in one before, you'll need to do some basic desensitization work. This should entail getting your dog familiar with being in the vehicle, even if it is not yet comfortable being in there for prolonged periods of time.

Ending1: [substeps] Open both rear doors so that your dog can see there is a way out. Seeing that it won't be trapped may help alleviate some of your dog's fears. Ending2: To do this, put the dog into the car with the windows down. Slowly angle the upper window closed, until your dog's paws are on the back of the seat. Ending3: Once you've acclimated your aggressive dog to being in the presence of an unknown entity, you can introduce your fearful dog to the car altogether. [substeps] Approach your dog as quietly as possible at first. Ending4: [substeps] Start by putting your dog in the vehicle and turning on the hazard lights. Your dog should then hiss in its mouth and let you know that " i am the owner.

Answer format: ending1/ending2/ending3/ending4