In the aftermath of the Big Growl that destroyed his city, a Lone Dog named Lucky must find a way to work with other dogs in order to survive in this frightening new world.
Lucky and the rest of the Leashed Dogs have settled in the forest--but a vicious Pack has claimed the land, and will stop at nothing to ensure that it is theirs alone.
The Wild Dogs' fierce Alpha reluctantly agrees to let the Leashed Dogs join their pack--but after learning of Lucky's role as a spy, Alpha casts him out of their camp and orders him to never return.
Lucky and the rest of his Pack encounter another group of dogs that has survived the Big Growl--and these new dogs may be their most dangerous enemies yet.