David Ayer's "Heart of the Beast" features Brad Pitt as James Belmont, a retired Special Forces officer, alongside his three-legged German Shepherd, Odin, a battle-scarred combat dog with titanium teeth. The film opens with James piloting a small plane through the Alaskan mountains with Odin, showcasing their deep bond forged through shared war experiences.

The plot quickly shifts when James suffers a heart attack while flying, leading to a plane crash that strands them 58 miles from the nearest road. The core of the film focuses on their perilous journey to survival through the Alaskan wilderness, facing obstacles such as a digitally created grizzly bear, a pack of wolves, and the harsh natural elements, including James sustaining a broken arm and numerous head injuries. Pitt's performance is noted for its authenticity and portrayal of a grizzled, resourceful veteran, while the dog, played by Uber and other canines, delivers a remarkably affecting performance.

Reviews praise the film for its compelling survival sequences and the palpable bond between James and Odin, often highlighting the dog's performance as equally, if not more, impactful than Pitt's. While some critics note a predictable pro-military undertone and patriotic messaging, the film's intimate scale and the raw emotion of the man-animal connection are consistently lauded. Directed by David Ayer and scripted by Cameron Alexander, "Heart of the Beast" is described as a stirring survival saga that, despite some cinematic tropes, resonates with audiences through its depiction of loyalty and resilience.