3) Height -
While large dog breeds have the nice benefit of being big enough to stick their noses out of the window, the small Pomeranian must struggle against the feelings of confinement when safely seated in a car. This can be resolved by obtaining the proper booster seat.
A booster seat - and do make sure it is a safe one - will keep the Pom raised enough to see out of the window. This is so important to help the puppy or dog fight the common issue of motion sickness.
When a dog's body is feeling one thing (movement) but his eyes are telling his brain something different (the inside of the car is not moving) this causes a problem in the inner ear which can make a dog very ill with dizzying motion sickness.
A dog may quickly develop a queasy stomach, vomit, become restless, whine and essentially suffer while the car is moving.
When a Pom has a bad experience like this, it makes him far more likely to put up a fight the next time the owner wants or needs to take him for a drive.
Therefore, the best car seat for your Pomeranian will also have the element of being a booster seat so that your Pom's face can be closer to a window (opened to varying degrees according to speed and weather conditions).