The greatest PR practice in the delivery business comes from UPS. Drivers carry dog treats and give them out at their stops. There is a facebook devoted just to photos of drivers all over the country making dogs' days. Our dog is no different, he absolutely loves our UPS lady who never fails to stop and load him up with treats. Yesterday she stopped and not only treated him, but gave him a huge hug.
This isn't just a gimmick to increase business for UPS, but with so many dogs fearful and aggressive with delivery services, this changes that whole dynamic.