Cat Parasite Prevention: Complete 2026 Guide

By Dr. Amanda Foster · October 12, 2026

Common Cat Parasites

Even indoor cats can get parasites. Fleas hitch rides on clothing, and mosquitoes that carry heartworm fly through open windows.

Flea Prevention

Year-round flea prevention is recommended for all cats. Topical treatments (applied to the back of the neck) are the most common. Oral medications are also available. Avoid dog flea products — permethrin is toxic to cats.

Tick Prevention

Outdoor cats in wooded areas need tick prevention. Check your cat daily during tick season (spring through fall). Remove ticks with fine-tipped tweezers, grasping close to the skin and pulling straight out.

Worm Prevention

Roundworms and Hookworms

Kittens should be dewormed at 2, 4, 6, and 8 weeks. Adult cats need fecal testing annually and deworming as needed.

Tapeworms

Often caused by ingesting fleas during grooming. If you see rice-like segments near the tail, treat for both tapeworms and fleas.

Heartworm

Heartworm is transmitted by mosquitoes and is fatal in cats. Monthly prevention is essential in mosquito-prone areas. There is no approved treatment for feline heartworm, making prevention critical.