Service German shepherd trained to open the door of the car and close it behind him. The German shepherd dog is extremely intelligent and restrained the animal becomes a guardian, defender, searcher, and hunter. The breed was created for decades.
There is an assumption that the German shepherd was bred during the great Patriotic war, but the opinion is wrong. It took a long selection before the light appeared modern German shepherd. The animal is extremely intelligent. Thanks to high intelligence, perfectly amenable to training. Consider how to train a German shepherd. To cultivate a restrained and intelligent dog supposed long and hard to educate.