Alpha
The Alphas are the leaders of the pack. There are two, a male and female, and are always mates. They are the most dominant, the best fighters, and the most reasonable. They are usually the only ones to have cubs, but will sometimes allow other pack members to mate. They always eat first.
Beta
The Betas are second in command. Like Alphas, there are two, male and female. They are also mates. They are the second most dominant and keep order if the Alphas are away. Alphas will almost always allow them to have cubs. They eat second, and keep other pack members away when the Alphas are eating.
Hunter
While the pack usually hunts together, sometimes there may be fighting or a sickness floating around. Hunters are told by the Alpha or Beta to bring back small meals that the pack can share. Hunters will sometimes lead the pack on a group hunt. They usually eat third, or they mix in with the rest of the pack.
Fighter/Warrior
These are uncommon, but sometimes there may be a rival pack or dangerous animals around that need to be driven off. Fighters will fight with the Alphas, or by themselves depending on the Alphas' availability. They are usually male, but the rare female may step in every now and then. One fighter almost always sticks with a group of scouts.
Scout
Scouts are also known as patrollers. Like the nickname implies, they patrol the pack border. A fighter almost always accompanies them just in case a threat happens to appear. They are the fastest and leanest of the pack so they can return to the Alpha or Beta as soon as possible.
Cubs/Pups
The youngest members of the pack. They are usually only born by an Alpha, but other members may mate, also. They either grow up to be scouts or hunters. If they are an Alpha's pups, or a Beta's, they may grow up and succeed their parents. Until they're 8 months old, they can lay around and do whatever they want. Omegas watch them when the pack is away.
Omega
The weakest, least respected wolves of the pack. They are either recent loners that have yet to prove themselves or pups born by the first Omegas. They are not allowed to mate, and if they do, their pups may be abandoned, killed, or suffer the same fate as them and remain an Omega for life. They always eat last.