Por_un_perro

: Three distinct lives in Mexico City are brought together by a horrific car accident .

: It is often cited as a guide to the "Butterfly Effect" in human relationships, showing how a single animal can alter the fate of multiple people . 2. Good Boy (Modern Horror Guide) por_un_perro

: The plot follows a loyal dog protecting its owner from supernatural entities in a rural home . : Three distinct lives in Mexico City are

The phrase is most famously associated with Alejandro González Iñárritu's 2000 masterpiece, Amores Perros . The title literally translates to "Love's a Bitch," but the stories are physically linked "by a dog." por_un_perro

In late 2025 and early 2026, "por un perro" trended alongside the release of the horror film Good Boy .