An Aswang, in Philippine folklore, is a ghoulish dog. A cross between a vampire and a werewolf. It is the most feared mythical creature in the Philippines, even in the 16th century, when Spanish settlers arrived. The Aswangs are shapeshifting creatures. During the day, they look like any human being, but at night, they can show their true form if they are in need of food. It is said that if an aswang married a human being, upon their wedding, his companion will also become an aswang, but the couple can rarely reproduce.