Eyeworm Infection in Dogs: A Closer Look Understanding The Causes and Treatment of Eyeworm Infections In Dogs

Eyeworm Infection in Dogs: A Closer Look https://cdn.pixabay.com/photo/2016/03/27/20/51/dogs-1284238_1280.jpg

Eyeworm infection, commonly known as Thelazia, is a parasite condition that affects all dogs. This article will go into more detail about this condition.

Eyeworm infection, also known as Thelazia, is a parasitic infection that affects dogs worldwide. Thelazia, a sort of worm that inhabits the conjunctival sac and the tissues around the dog's eye, is the culprit for this infection. Although this ailment is uncommon, if left untreated, it can cause substantial discomfort and potentially result in serious eye injury. 

We will go through the causes, symptoms, and available treatments for canine eyeworm infections in this article. We'll also look at how you may keep your pet from developing this painful and sometimes dangerous disease.

Causes of Dog Eye Worms

A dog eye worm is caused by a dog eye parasite known as Thelazia. The infection happens when an infected fly, usually a face fly, feeds on an infected animal's tears and then deposits the worm's larvae onto the eyes of an uninfected dog. The adult worms emerge from the larvae as eggs, which can cause serious inflammation and irritation in the affected dog's eyes.

Face flies are more widespread in places like rural areas with sizable herds of cattle and horses, where there are also higher rates of illness. Dogs who are exposed to these animals and spend time outside are more likely to become infected. In addition, the infection may be more likely to affect dogs whose immune systems have been compromised by disease or medication reaction.

However, eyeworm infection is not contagious between dogs, meaning that a dog cannot contract the infection from another infected dog. However, multiple dogs in the same area can become infected if they are all exposed to infected face flies.

Dog Eye Worm Symptoms

Eyeworm infection in dogs can lead to the following:

  • Eye discomfort: Infected dogs may have eye irritation, inflammation, and discharge due to the presence of adult worms and their eggs.

  • Frequent blinking and squinting: The discomfort brought on by the worms may lead infected dogs to blink and squint excessively.

  • Conjunctivitis: The infection can cause the conjunctiva (the thin membrane that lines the eyelids and covers the white part of the eye) to become red, swollen, and inflamed.

  • Corneal ulcers: In severe cases, an eyeworm infection can lead to corneal ulcers, which can cause vision impairment or even blindness if left untreated.

  • Head shaking: Infected dogs may shake their head frequently in an attempt to alleviate the discomfort caused by the infection.

  • Vision difficulties: In severe situations, eye worms can cause vision problems such as impaired vision or difficulty seeing.

  • Worms in the eye: In rare situations, the worms may be visible on the surface of the eye or in the tear ducts.


Diagnosing Thelazia in dogs typically involves a thorough eye exam performed by a veterinarian. The veterinarian will search for indications of irritation, inflammation, and discharge in the eyes throughout the examination. To check for the existence of adult worms or their eggs, they might also utilize a specialized magnifying lens.

The veterinarian may occasionally take a sample of the ocular discharge and examine it under a microscope. By doing so, you can rule out other potential causes of eye irritation and inflammation, such as bacterial or viral infections, and help confirm the existence of eyeworms.

It's crucial to get your dog to a veterinarian as soon as you see signs of an eyeworm infection so they may be properly diagnosed and treated. Early diagnosis and treatment can help stop additional eye damage in your dog and reduce discomfort.

Dog Eye Worm Treatment and Prevention

Treatment of eye parasites in dogs typically involves the removal of adult worms from the eye. Your veterinarian may use forceps or a special instrument to gently extract the eye worms from the conjunctival sac. In some cases, topical medications may also be prescribed to reduce inflammation and prevent secondary infections.

Prevention is key when it comes to eyeworm infection. You can help cut down the possibility of your dog contracting the infection by taking the following steps:

  • Keep your dog indoors during peak fly season: Face flies are most prevalent during the summer months, so keeping your dog indoors during this time can reduce their exposure to infected flies.

  • Use flea repellent: Applying flea repellent to your dog's coat can help prevent them from being bitten by infected flies.

  • Keep the eyes clean: Regularly cleaning your dog's eyes with a saline solution can help remove any flies or debris that may be present.

  • Routine veterinary checkups: Frequent veterinary checkups can help ensure that your dog's eyes are healthy and free from infection.

Was this article helpful?