Does anyone know the title for this graphic novel...?

It's a post apocalyptic story where nuclear has rendered the earth a wasteland much like what you see in Mad Max. The story follows a little boy and his dog as they try to survive, and they wonder if they are alone. The boy and his dog eventually meet a young girl who has somehow survived the whole ordeal. The boy and the girl develop an attraction to one another as they are the only two humans left presumably. But, as they began to run out of food and are left to wonder how they can continue, the story takes a decidedly disturbing and completely unexpected turn that would disgust and horrify most readers. Any clue?