After a terrible disease wiped out all of mankind, the world's population of dogs decreased tremendously. Only after the dogs learned to form wild packs and relearn their wild ways were they able to gain back their numbers.
Most of the world's old monuments have rusted and have aged with time. All the plants have overgrown everything, leaving the world in an jungle like state. The dogs usually occupy the shells of last city, sleeping among the rubble.
The packs have learned to be mean and rough but have a secret soft side. They don't have a ranking system that's complex but it's extremely simple.
The highest rank is the leader which there are usually two of. The female leader and the male leader. They are usually mates but sometimes a male or female forces there way into the spot. Anyone can take a leader down and overtake the spot.
Next in line are the workers. There are usually at least 10 in a pack and are the strongest and largest. They do most of the guarding and monitoring.
Then there are the hunters which their can be an unlimited number of. They can range from small dogs to large. They are the ones that go out and hunt for prey.
Then there are the the rest which consist of mothers with pups, pups, the injured, and elders. They do not preform actions but they get the same respect.
Their are the apprentices who are young dogs learning to hunt and attack.
The rest are no bodies. The no bodies are usually prisoners who are kept as hostages. They get fed the least and are used as fighting dummies.