Yes, snakes can pose a threat to pigs. Depending on the size and species of the snake, it could potentially attack and kill a pig, especially if the pig is young or small. Snakes are known to prey on a variety of animals, including rodents, birds, and other small mammals, and they may view pigs as potential prey as well. Additionally, some species of snakes are venomous, and their bites can be deadly to pigs and other animals. It's important to take appropriate measures to protect your pigs from potential predators, including snakes, by ensuring that their housing is secure and by keeping the surrounding area free of debris and overgrowth where snakes might hide.