Dogtooth (Greek: Κυνόδοντας, translit. Kynodontas) is a 2009 Greek film directed by Yorgos Lanthimos about a husband and wife who keep their children ignorant of the world outside their property well into adulthood. The film stars Christos Stergioglou, Michelle Valley, Angeliki Papoulia, Mary Tsoni, and Christos Passalis.
Lanthimos' second feature film 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.
A couple and their adult son and two adult daughters live in a fenced compound. 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 holding their hands under hot water, and are rewarded with stickers for good behaviour and punished with violence for bad. They believe they have a brother on the other side of the fence to whom they throw supplies.