When you put on the Bergan dog car harness for the first time, it can seem a bit complicated. Adjusting the neck size and girth size is not as easy as the instructions make it seem. Luckily, Bergan has a great instruction video to help us out.
Once you learn how to put on the Bergan dog car harness, you never have to adjust the sizing again (except perhaps for minor re-fittings due to extended use or your dog changes weight). Once it is sized, it is super easy to put on and use again and again.