To protect your indoor cat from dangerous parasites, maintain regular parasite control measures, including administering preventative medications against fleas, ticks, and heartworms, as recommended by your veterinarian. Ensure your home is clean and free from pests by vacuuming regularly and promptly disposing of garbage. Use screens on windows and doors to prevent mosquitos and other insects from entering. Regular veterinary check-ups will help detect any signs of parasite infestation early, allowing for prompt treatment. Even indoor cats can be exposed to parasites brought in from outside, so preventative care is crucial.