In a Hungarian city, a 13-year-old girl named Lili is forced to give up her cherished mongrel dog, Hagen, due to a new law favoring purebreds and imposing heavy fines on owners of mixed-breed dogs. Her father, with whom she temporarily lives, cannot afford to keep Hagen and abandons him on the streets. Determined to find her lost companion, Lili embarks on a desperate search throughout the city. Meanwhile, Hagen faces a harrowing journey, evading capture and encountering various forms of exploitation and cruelty. Despite these hardships, his spirit remains unbroken as he navigates the perilous urban landscape.

As Lili continues her search, Hagen’s plight takes a darker turn when he is captured and sold into the illegal world of dog fighting. Struggling for survival, Hagen undergoes a significant transformation and eventually escapes his brutal circumstances. Rousing a pack of similarly mistreated dogs, he leads a vengeful uprising against human oppression. The stray dogs roam the city in a coordinated revolt, causing chaos and demanding recognition of their plight. The story intensifies as the paths of Lili and Hagen inevitably converge, examining themes of loyalty, resilience, and the bond between humans and animals in a society that marginalizes those who do not fit in.