"Pack order" refers to the social ranking or hierarchy within a group, particularly among animals that live together in a pack. It establishes who is in charge and holds more power or authority over others. Full definition
The second in command in a pack may be a worthy leader ready to step up, since this dog often does most of the enforcing of pack order. (lowchensaustralia.com)
Candidate with possess accurate data entry skills, filing, scanning and assisting as needed with packing orders for shipments. (careerbuilder.com)
In addition, dogs depend on pack order for a sense of security. (paw-rescue.org)