The phrase "model citizen" refers to a person who shows good behavior and follows the laws of their society. They are considered an example for others to follow and are seen as an ideal member of the community. Full definition
This course will focus on training you and your dog to become model citizens and great representatives of the canine community. (edmontonhumanesociety.com)
Teachers were also expected to act as model citizens during their free time. (edutopia.org)
I've seen many «before and after» photos, and read many stories of pit bulls that were taken out of rescue in horrible shape, and turned into model citizens. (samthedogtrainer.com)