What causes eye worms in dogs?

Eye worms in dogs aren’t just a minor annoyance—they can lead to serious discomfort and even vision issues if left unchecked. Most cases trace back to Thelazia californiensis, the primary parasite responsible for this condition in many regions. These tiny worms live in a dog’s conjunctiva or under the eyelids, and they’re usually transmitted by flies. When an infected fly lands on a dog’s eye to feed on tears, it deposits worm larvae, which then mature into adult worms over a few weeks.

This transmission cycle means dogs that spend lots of time outdoors are at higher risk, especially in warm, humid areas where flies thrive. If you let your dog roam in parks, wooded spots, or even your backyard without supervision, they’re more likely to encounter these carrier flies. It’s also important to note that some local regulations require pet owners to take preventive measures against parasites—failing to do so might not just harm your dog, but could also violate area pet health guidelines.

Another factor to consider is your dog’s grooming habits. Dogs that scratch their eyes frequently or have matted fur around their eye area might be more susceptible. The scratches can create small openings for larvae to enter, and matted fur can trap flies close to the eye. Regular grooming sessions, using pet-safe products, can help reduce this risk while keeping your dog comfortable.

If you suspect your dog has eye worms, it’s crucial to seek help from a licensed veterinarian right away. Trying to remove the worms yourself can cause further damage to your dog’s eye, and delay treatment can lead to infections or even vision loss. Veterinarians have the tools and expertise to safely remove the worms and prescribe any necessary medications to prevent future infestations. They can also provide advice tailored to your local area’s climate and parasite prevalence.

Taking proactive steps to protect your dog from eye worms is one of the best ways to keep them healthy and happy. This includes keeping your yard clean to reduce fly populations, using vet-recommended parasite preventives, and scheduling regular check-ups. By staying aware of the risks and following local pet care guidelines, you can help ensure your furry friend avoids the discomfort of eye worms and enjoys a long, healthy life.