Maggots in Wounds (Myiasis) in Dogs: What to Do

Myiasis is the medical name for fly larvae, or maggots, living in an animal's skin or in a wound. Vets also call it fly strike. It happens most in warm weather, and it can turn a small wound into a deep, painful injury within days. Stray dogs, outdoor dogs, and dogs that are old, sick, or injured are most at risk.

If you find maggots on a dog, whether it is your own dog or a stray you just picked up, a veterinary visit the same day is strongly recommended. This article explains why, and what you can do on the way.

How dogs get maggots

Several kinds of flies cause myiasis, including blow flies, bottle flies, house flies, and flesh flies. The females look for moist, smelly places to lay their eggs. A fresh or infected wound is the most common target. Fur that is matted and soiled with urine, feces, or discharge also draws them in, and larvae that hatch in dirty fur can reach the skin and any wound nearby.

In warm, moist conditions, blow fly eggs can hatch within a day. Some flesh flies skip the egg stage and place live larvae straight into a wound or a body opening. The larvae feed on the wound and the tissue around it. Some species mostly eat dead tissue and discharge. Others burrow into living skin and muscle, and the damage can spread quickly.

In Southern and Eastern Europe, one flesh fly is a particular concern. Wohlfahrt's wound myiasis fly (Wohlfahrtia magnifica) is found around the Mediterranean and in Central and Eastern Europe. It mainly affects sheep and other livestock, and cases in dogs have been reported in dogs that live close to infested herds. Its larvae feed on living tissue and can cause severe damage. In 2024, researchers in Serbia reported the fly in sheep there, the first reported cases in the Western Balkans in about 80 years.

Some dogs are more likely to be targeted. These include stray and outdoor dogs with bite wounds, cuts, or road injuries, and old, weak, or sick dogs that cannot groom themselves or move away from flies. Dogs with incontinence or diarrhea, long matted coats, or skin disease are also at higher risk. So are dogs recovering from surgery, mothers soon after giving birth, and newborn puppies, whose healing navel attracts flies.

Signs to watch for

Sometimes the maggots are easy to see. They look like small white or cream-colored worms moving in a wound or in wet fur. Often they are hidden under matted hair or inside pockets under the skin, so other signs matter too.

• A strong smell of rot coming from the dog
• A wet, sticky, or matted patch of fur, often with discharge
• A wound that keeps getting larger or has small holes in it
• Raised, red sores or lumps under the skin
• Licking, biting, or scratching at one spot, or crying when it is touched
• Restlessness, hiding, low energy, or poor appetite

Common places include wounds on the legs, neck, and head, and the areas around the tail, anus, and genitals. Flies may also lay eggs or larvae in or near the ears, eyes, nose, and mouth.

When it is an emergency

Maggots in a wound are an urgent problem, and a vet visit the same day is recommended. The larvae keep feeding day and night, and a small sore can become a deep cavity. A heavy infestation can make a dog very ill through infection, toxins, and shock, and without treatment it can be fatal.

Going straight to the nearest clinic is recommended if the dog is weak or has collapsed, has pale gums or fast breathing, will not eat, or has maggots near the eyes, ears, nose, mouth, or genitals. Newborn puppies with maggots should also be seen right away.

What to do on the way to the vet

Vets advise owners not to try to remove maggots themselves. Cleaning the wound properly usually takes sedation, good light, and the right tools. A few simple steps help in the meantime.

• Call the clinic first so the team can get ready for you.
• Handle the dog gently. The area is painful, and even a calm dog may bite.
• Keep the dog indoors or somewhere shaded where flies cannot reach it.
• Wrap the dog in a clean towel or blanket for the trip if that helps you carry it.
• Wear gloves if you have them, and wash your hands well afterward.
• Avoid digging into the wound, squeezing it, or pulling at deep maggots. This hurts the dog and can push larvae further in.
• Avoid pouring anything into the wound. Gasoline, kerosene, bleach, and other harsh chemicals damage healthy tissue and can make the dog sicker.

How vets diagnose and treat it

Diagnosis is usually simple, since the vet can see the larvae. The harder part is finding out how far they have spread. The vet will usually clip the fur around the area to see the full size of the wound and to remove larvae hiding in the coat. Many dogs need sedation or general anesthesia, because the wound is painful and larvae can hide in deep pockets and tunnels. In some cases the vet sends larvae to a lab to identify the fly species.

Treatment usually includes flushing the wound, removing the larvae by hand, and cutting away dead tissue. The vet may also give medicine that kills remaining larvae, antibiotics for infection, and pain relief. Weak dogs may need fluids and a stay in the hospital. The vet will also look for the problem that attracted the flies, such as a bite wound, skin disease, or soiling from diarrhea, and treat that too.

Recovery depends on how deep the damage goes and how soon treatment starts. Early treatment gives the best chance of a good outcome. Deep wounds may need several rechecks and dressing changes, and larvae hidden in deep pockets can be missed on the first clean. At home, it helps to follow the vet's wound care plan closely and to keep the dog clean and indoors while the wound heals. A cone can stop the dog from licking or chewing the area.

Other pets and people

If a dog has myiasis, the flies that caused it are active nearby. They can target any animal or person with an open wound, although people are affected only rarely. Myiasis does not spread directly from one dog to another or from a dog to a person, and the larvae in a dog's wound cannot start a new infestation in you or another pet.

Other pets in the home are worth checking for wounds or soiled fur. Any cut on your own skin is best kept covered, and washing your hands after handling the dog is a good habit.

How to prevent it

Most cases start with a wound or dirty fur, so prevention comes down to cleanliness and quick care. In warm months, regular checks of the skin and coat help, especially around the tail and bottom, on the legs, and under the collar. A vet check is recommended for any wound, even a small bite, and it helps to keep the wound clean as the vet advises. Long coats are safer when they are groomed and free of mats. Old, disabled, or incontinent dogs may need help to stay clean and dry, and washing their bedding often helps too. Around the home, clearing away garbage, feces, and rotting food leaves flies fewer places to breed. Dogs healing from surgery or an injury are safer indoors during the summer. Your vet can also advise on routine parasite prevention that suits your dog.

Rescued and adopted dogs

Stray dogs face a higher risk in summer. Many have untreated wounds or dirty, matted coats, and some are too weak to keep flies away. At Paw Squadron, the first stops after every rescue are the vet and a bath. Each animal gets a checkup, deworming, and treatment against fleas and other parasites. Before adoption, every animal also gets vaccinations and a microchip.

If you find a stray dog with maggots, the kindest help is a quick trip to a vet. For adopters, myiasis is not something a dog carries into its new home. Once the larvae are cleared and the wound has healed, the infestation does not stay in the body, and the usual prevention steps apply as for any dog. If you have questions about a dog you would like to adopt, you can send an adoption inquiry, and you can find more parasite guides in PawPedia.