You can tell what rank each Dragon goes into by a glowing chest that stops close to the middle of their necks and wings. they start glowing once the middle of their teens.
alpha dominant or/and leader of a group or pack. their glow is red
Betas The job of the Betas is to serve as an advisor/helper to the Alpha(s) exclusively and to help them greet newcomers. Their glow is blue.
Delta They act as mediators (eg. helping to resolve disagreements), messengers (taking messages between pack members or between packs) and counselors (helping pack members with any troubles they might have). There is glow is green.
Gamma protector, if you will. The Gammas are responsible for making sure that everything is safe. Their glow is orange.
Omega An Omega is the lowest ranking member The Omega has a lot of spare time and usually goes hungry for food if there is a food shortage. Their glow is white.
Zeta refers to creatures who have opted out of traditional societal expectations that serve as a helper, builder, protector, provider, defender, and mates while accepting that these roles also require them to be disposed of if required – in mind, body and not infrequently in death. their glow is a sliver.