To prevent mites in pet snakes, it's important to regularly clean and disinfect their enclosure, including all hiding spots, water dishes, and decor. Additionally, make sure to quarantine any new snakes before introducing them to others in your collection, as mites can spread easily between snakes. Regularly check your pet snake for any signs of mites, such as tiny black or red dots, and consult a veterinarian if you suspect an infestation.