I used the Easy Rider harness for my 20 lb rescue mixed breed dog Sherman for many, many years. Fortunately, we were never in an accident. However, it kept him well situated in the car. He was comfortable, but not able to just move at will, making it safer for both of us. When he saw me get the Easy Rider, he went out of his brains with excitement because he knew he was going for a car ride. The only time I had trouble getting him into the harness was when he was excited or I wasn't paying close enough attention. Else, I didn't find it all that difficult to put on him. Sadly, I had to say goodbye to him earlier this year. He was 18 1/2; a long and happy life which included lots of car rides. Thank you for such a great product that combines safety with really happy memories.