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The Thelazia californiensis species of dog eyeworms are whitish worms found in the eyes of domestic dogs and cats. Humans have been known to become infected, but it is very rare. The eyeworms visibly move across the dog’s eyes in a rapid, serpentine motion. As many as a 100 worms may be present in the tear ducts, on the conjunctiva (the mucous membrane that covers the front of the eyes) and under the eyelids. This species of eyeworm is most commonly found in western North America and is more prevalent during fly season (late spring through early fall).
Eyeworms are parasites of the orbits of the eye, found on the conjunctiva and under the lids and nictitating membrane. This disease is commonly known as thelaziasis.
Eyeworm (Thelazia californiensis) Average Cost
From 433 quotes ranging from $500 - $1,500
Average Cost
$900
One or more of the following symptoms are usually noticed during an infection of dog eyeworms:
Types
Thelazia californiensis is a species of parasitic roundworm that affects dogs, cats, and sometimes humans. It was first discovered in California during the 1930s and was recognized as a new species of eyeworm at that time. There are approximately a dozen species of eyeworms, but Thelazia californiensis is the most prevalent type that occurs in domestic animals such as dogs. Three to four year old, large dogs are more likely to become infected than younger, smaller dogs.
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Transmission of face fly, housefly, or filth fly larvae is the cause of infection of the Thelazia californiensis species of dog eyeworm. The adult female eyeworm lays eggs in the tears of the eyes. Once in the tears, the eggs develop into larvae, which a face fly will then ingest. Inside the fly, the larvae develop for approximately 30 days at which time they will move to the mouth of the fly. When the adult flies are feeding near a dog’s eyes, the larvae move out of the fly’s mouth and move to the eyes of the dog. It takes about 3-9 weeks for the larvae to develop into adults and repeat the cycle.
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Your veterinarian will examine and evaluate the dog’s eyes and tissues near the eyes. The eyes may be flushed (rinsed) to clean the infection and help to prevent secondary bacterial infection. The matter collected during the rinsing of the eyes may also be examined for presence of the worm. The dog eyeworms are usually very active and easy to see, making the diagnosis obvious. Your veterinarian may choose to remove the eyeworms. Most likely your dog will just be treated with medication. The medication will be sent home with instructions for continued treatment.
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The method of treatment to eliminate the Thelazia californiensis eyeworm must be determined by your veterinarian. Correct use of these medications is necessary to achieve complete elimination of the eyeworm infection. The following are a few methods that may be recommended or administered.
Local anesthetic may be administered to the dog’s eyes by your veterinarian. Then forceps will be used to carefully remove the worms from the eyes.
Anti-parasitic topical eye solutions and ointments such as selamectin, moxidectin and levamisole solutions, or levamisole and morantel ointments may be prescribed. Sometimes administering eye treatments to your dog can be difficult. It requires your dog to be still for a brief time, which may require some assistance, especially if your dog is experiencing a lot of pain and discomfort from the infection.
Injected anti-parasitic medication such as moxidectin is sometimes administered by the veterinarian. This will be injected into the muscle of the dog.
Anti-parasitic oral medication such as ivermectin tablets, moxidectin tablets, or milbemycin oxime tablets are often times prescribed. This is an easy way to treat the disease.
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In order to prevent eyeworms of the dogs, the fly population needs to be controlled. Controlling or eliminating the fly population and the opportunity for the face flies to feed on the dog’s eyes will significantly reduce the spread of the eyeworms. Waste management is necessary by removing accumulations of garbage, scraps, manure, and other matter and filth where flies like to live will help dramatically. While taking your dog for a walk in an area with a large fly population, using a fly repellent may be advisable.
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Eyeworm (Thelazia californiensis) Average Cost
From 433 quotes ranging from $500 - $1,500
Average Cost
$900
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Ask a Vet
Corgi Aussie Mix
Six Years
Unknown severity
0 found helpful
Unknown severity
Has Symptoms
Hello, my dog has had something in his eye for a few weeks now. I can’t tell if it’s hair, mucus, or some sort of parasite. It doesn’t appear to move by itself. When I try to wipe it out, it clearly is movable but I haven’t gotten it out and I don’t want to scratch his eye.
Oct. 6, 2020
Owner
Dr. Michele K. DVM
0 Recommendations
Thank you very question. There are no parasites that live in the eye, so what you're describing is probably a hair that is building up with discharge. If it is not bothering his eyes, it is okay to just monitor, but if it is making his eye red or the discharge is increasing, then it would be best to have him seen by a veterinarian.
Oct. 6, 2020
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Blackie
terrior mix
3 Days
Moderate severity
0 found helpful
Moderate severity
Has Symptoms
I have a 3 day old puppy who today we noticed one eye is open and covered in worms. Trying to figure out what to do? They were born outside and we didn't find them til this morning. The mother is a stray that is skittish of humans that we been feeding about 4 months she is taken care of all 4 of them still but wondering what we can do to make sure all 4 survive.
Sept. 18, 2018
Blackie's Owner
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Alex
Shih Tzu
11 Years
Mild severity
0 found helpful
Mild severity
Has Symptoms
Hi.My shih tzu dog aged 11. He has already been affected by this which lead to blindness. Now he is affected by this worms. Although we've met the vetenarian,his condition hasn't change but getting worst. Dr, could you suggest any kind of medication or home remedy to cure him. Tq
May 3, 2018
Alex's Owner
Dr. Michele K. DVM
0 Recommendations
There are no home remedies that I am aware of to treat this condition, unfortunately. If the medications given by your veterinarian have not helped, we can often use this information to try and figure out what is going on and how to treat it - it would be best to have a follow up with your veterinarian, as they can look at him, assess him, and determine how to help him. I hope that all goes well for him.
May 3, 2018
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Lou
australian shepherd mix
11 Years
Mild severity
0 found helpful
Mild severity
Has Symptoms
I have a senior dog with a small white line in his pupil. It doesn’t seem to move so I am not convinced that it is a worm. No weeping or anything. He has early stage glaucoma.
Feb. 28, 2018
Lou's Owner
Dr. Michele K. DVM
0 Recommendations
Thank you for your email. Without seeing what you are looking at with Lou, I can't comment on what it might be. It would be best to have him examined by a veterinarian, as they can look at the line and determine what might be going on.
Feb. 28, 2018
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Cody
Labrador
13 Years
Mild severity
0 found helpful
Mild severity
Has Symptoms
I live in Pittsburgh, Pa. My 13 yr old Lab has a dark sack on his right eyelid, is this a parasite and is there anything safe that I can put on it prior to a vets visit. Thank you, Vince
Nov. 3, 2017
Cody's Owner
0 Recommendations
It is possible that the ‘sack’ you are seeing is a meibomian gland cyst or chalazion which would need to be checked by your Veterinarian; without examining the eye for myself I cannot say for sure. In the meantime keep an eye on it and if it starts getting bigger visit your Veterinarian sooner. Regards Dr Callum Turner DVM
Nov. 3, 2017
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Hokulani
Golden husky mix
1 Year
Mild severity
0 found helpful
Mild severity
Has Symptoms
Hello, I have a 1 year old golden mix husky dog and recently I saw that my dog corneas are getting white. At first, I didn't think of it that much, but after 2 days I saw my dog's eyes. I started seeing that Hokulani's was squinting her eyes the whole day. and when my father went to go check on her. we saw that her eyes are swollen and both of her third eyelids are visible and looks like its covering half of her eyes. So we couldn't see her corneas. At first, my father told me it could be because she likes to play fight with her sister and father. So I thought I could an infection or trauma. But my father also suspects it could be an eyeworm. So my father gave her eyedrops (for dog) and medicine for worms. and told me to give it 2 days if it's doesn't heal we can go to the vet. But I am still worried, So should I listen to my father or immediately go to the vet. What should we do after the visit? Thank you for your time, doctor.
Eyeworm (Thelazia californiensis) Average Cost
From 433 quotes ranging from $500 - $1,500
Average Cost
$900
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