The common domesticated pig doesn’t really have any predators, unless humans raising and killing them for food is factored in.
Wild pigs and boars, however, can become meals for larger carnivores present in the area, including wolves, bears and big cats. Young pigs may be prey for large birds or smaller animals like raccoons, and wild pigs may also fall victim to water predators, including crocodiles and alligators.
Pigs are deceptively fast and usually choose to evade predators by running away. Domestic hogs that don’t have tusks may not have any additional defense mechanisms, but wild boars use their tusks, and hooves to an extent, to defend themselves.