Horse and Woman and Dog (1990)

Horse and Woman and Dog 1990 / 馬と女と犬 1990 / 馬と犬と貴婦人 , Uma to onna to inu , Mitsuryo no migiwa , Uma to inu to kifujin , Horse-Woman-Dog , Horse and Dog and Lady , Ruff Sex

Three social outcasts who live near the seaside interact with each other in increasingly disturbing ways. The trio of characters are a woman who has killed her sister, a man who enjoys necrophilia, and a female amnesiac. The first woman engages in sadistic pursuits such as capturing young women at the beach to force them to engage in sexual activities, including copulation with a horse and a dog. Source: Wikipedia