Amores perros is a 2000 Mexican psychological drama film directed by Alejandro González Iñárritu (in his feature directorial debut) and written by Guillermo Arriaga, based on a story by both. Amores perros is the first installment in González Iñárritu's "Trilogy of Death", succeeded by 21 Grams and Babel. It makes use of the multi-narrative hyperlink cinema style and features an ensemble cast. The film is constructed as a triptych: it contains three distinct stories connected by a car crash in Mexico City. The stories centre on: a teenager in the slums who gets involved in dogfighting; a model who seriously injures her leg; and a mysterious hitman. The stories are linked in various ways, including the presence of dogs in each of them.

The title is a pun in Spanish; the word "perros", which literally means "dogs", can also be used to refer to misery, so that it roughly means 'bad loves' with canine connotations. The film was released under its Spanish title in the English-speaking world, although it was sometimes translated as Love's a Bitch in marketing. The soundtrack includes songs by Latin American rock bands including Café Tacuba, Control Machete, and Illya Kuryaki and the Valderramas.

Amores perros premiered on May 14, 2000 at the 2000 Cannes Film Festival and was released in Mexican theaters on June 16, 2000. Amores perros was a Mexican commercial and critical success and was nominated for the Academy Award for Best Foreign Language Film in 2000 and won the Ariel Award for Best Picture from the Mexican Academy of Film. Amores perros has been considered one of the best Mexican films by many. Filmmaker Denis Villeneuve praised Amores perros as one of the best films of the 21st century.

In December 2020, Amores perros was remastered by The Criterion Collection. In May 2024, a 4K remaster was screened in the Cannes Classics section at the 78th Cannes Film Festival, with the worldwide rights of the film being acquired by Mubi, with the remaster being re-released in Mexican theaters on October 9, 2025, and set was released in the Mubi streaming service worldwide on October 25.

The film is constructed from three distinct stories linked by a car crash that brings the characters briefly together.

Octavio (Gael García Bernal) is in love with Susana (Vanessa Bauche), his abusive brother Ramiro's (Marco Pérez) wife who he has a child with. She confides in Octavio that she is pregnant again, and he tries to persuade her to run away with him, saying he will help raise her children with her. Local thug Jarocho, happy after winning in a dog fight, intends to his dog loose on some strays but is threatened by a homeless man wielding a machete. Instead, Jarocho sics his dog on Octavio's rottweiler, Cofi, but his own dog is killed instead. Octavio and his friend Jorge (Humberto Busto), realising Cofi's potential, become involved in the dogfighting scene. Octavio makes enough money to flee with Susana, and pays Mauricio, the owner of the dogfighting venue, to get Ramiro beaten up. Afraid, Ramiro steals the money and leaves with Susana. Struggling financially, Octavio accepts a challenge by Jarocho to participate in a private dogfight, with no outside bets. Cofi is about to win, but Jarocho shoots him. The infuriated Octavio stabs Jarocho in the stomach. Pursued by Jarocho's thugs, Octavio finds himself in a car chase with Jorge and the wounded Cofi. A collision follows; Jorge dies and Octavio is badly injured.

Magazine publisher Daniel (Álvaro Guerrero) leaves his family to live with his lover Valeria (Goya Toledo), a Spanish supermodel. On the day they move in together, Valeria's leg is severely broken in Octavio's car crash and she is unable to continue working as a model. As Valeria is recuperating in Daniel's apartment, her dog Richie disappears under a broken floorboard and becomes trapped. The missing dog triggers tension and arguments for the couple, leading to doubts about their relationship on both sides. Trying to rescue the dog, Valeria again injures her leg; Daniel finds her hours later. Valeria's new leg injury results in severe arterial thrombosis and eventually gangrene. Her leg is amputated. While she is in the hospital, Daniel finally rescues Richie from the floorboards. When she returns, Valeria drives her wheelchair through the torn-up lovenest and looks out of the window expecting to see a billboard bearing her likeness, only to find it has been removed.

The homeless guy occasionally seen in Octavio's story is revealed to be a professional hitman called El Chivo (Emilio Echevarría). He is a former private school teacher who was imprisoned after committing terrorist acts for guerrilla movements. He is trying to make contact with his daughter, Maru, whom he abandoned when he began his guerrilla involvement and who believes that he is dead. He is about to perform a hit on a businessman when Octavio's car crash interrupts him. During the chaos at the car crash, he steals Octavio's money and takes the wounded Cofi to his warehouse hideout to nurse the dog back to health. One day, while El Chivo is out, Cofi kills all the other mongrel dogs El Chivo is caring for. He is about to kill Cofi, but decides against it. Meanwhile, Octavio's brother Ramiro is shot and killed during an attempted bank robbery.