Dogtooth (; Kynodontas) is a 2009 Greek psychological drama film directed by Yorgos Lanthimos. Written by Lanthimos and Efthymis Filippou, the film is about a husband and wife (Christos Stergioglou and Michelle Valley) who keep their children (Angeliki Papoulia, Mary Tsoni and Christos Passalis) ignorant of the world outside their property well into adulthood. Dogtooth is Lanthimos's second feature film. It won the Prix Un Certain Regard at the 2009 Cannes Film Festival and was nominated for Best Foreign Language Film at the 83rd Academy Awards. Plot A couple live in a fenced-in compound with their adult son and two adult daughters. The children have no knowledge of the outside world; their parents say they will be ready to leave once they lose a dogtooth, and that one can only leave safely by car. The children entertain themselves with endurance games, such as keeping a finger in hot water. They believe they have a brother on the other side of the fence to whom they throw supplies or stones. The parents reward good behavior with stickers and punish bad behavior with violence. The father pays a security guard at his factory, Christina, to come to the house and have sex with his son. Frustrated by the boy's refusal to give her cunnilingus, Christina trades her headband with the elder daughter in exchange for oral sex from her. The elder daughter persuades the younger daughter to lick her shoulder by bartering the headband. Later, the younger daughter volunteers to lick the elder again. The elder has nothing to offer in exchange, but the younger does not mind and experiments by licking other body parts. The father visits a dog-training facility and demands to have his dog returned. The trainer refuses because the dog has not finished its training, and asks: "Do we want an animal or a friend?" When the children are terrified by a stray cat in the garden, the son kills it with a pair of pruning shears. Deciding to take advantage of the incident, the father shreds his clothes, covers himself in fake blood, and tells his children that their unseen brother was killed by a cat, the most dangerous creature. After he teaches them to bark on all fours to fend off cats, the family holds a memorial service for the brother. Christina again barters for oral sex from the elder daughter. The daughter rejects her offer