Set in the now-passed year of 2024, A Boy and His Dog depicts an Earth devastated by World War IV—a conflict that lasted only five days but left the surface a scorched, lawless desert. The world is bifurcated between the 'Solo' scavengers who roam the surface ruins and the 'Downunder' dwellers who have preserved a sterile, 1950s-style Americana in massive subterranean bunkers. This alternate timeline diverges from our reality through its accelerated nuclear escalation and the development of telepathic biological links between humans and animals.

The societal dynamics center on a brutal struggle for basic biological needs. On the surface, the economy is entirely based on scavenging and pre-war canned goods, while the underground society of Topeka maintains order through a totalitarian 'Committee' and robotic enforcement. This subterranean world represents an extreme form of isolationist traditionalism, where technological prowess is used solely to maintain a suffocating, artificial mimicry of the past, including the use of synthetic food production and mechanical life-extension for their social order.

As a predictive piece, the film's vision of 2024 is more thematic than technical. While we have not achieved interspecies telepathy, the film's depiction of a fractured society living in completely different information and physical silos resonates with contemporary social polarization. The 'Downunder' obsession with nostalgic aesthetics and artificial environments mirrors modern critiques of digital echo chambers and the sanitization of history. Furthermore, the film’s focus on extreme resource scarcity and the collapse of global infrastructure remains a staple of modern climate-era speculative fiction, even if the nuclear catalyst has (so far) been avoided.