A sickness wiped out all humans, killing them in terrible, terrible ways. Animals and dogs seem to have been immune to the sickness, now roaming the abandoned lands alone. Animals seem to have weird mutations, super sharp teeth, bigger sizes and characteristics they should not posses.
Why? This is the question circling around the dogs. What is causing this? Will humans ever come back...? Will the dogs survive in the now very dangerous lands? That's something, we shall find out...