Beyond cinema, the phrase appears in modern digital culture:
In late 2025 and early 2026, "por un perro" trended alongside the release of the horror film Good Boy .
: The plot follows a loyal dog protecting its owner from supernatural entities in a rural home . por_un_perro
: 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)
: Social media discussions often focus on "ending explained" guides, as the film uses a dog's point of view to leave the audience questioning what was real and what was supernatural . 3. Cultural & Social Trends Beyond cinema, the phrase appears in modern digital
: It is marketed as the first horror film where a dog is the primary protagonist .
: Three distinct lives in Mexico City are brought together by a horrific car accident . Cultural & Social Trends : It is marketed
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."