Maggots feeding on a living animal need to be removed as quickly as possible. Left untreated, the infestation (called myiasis or flystrike) can cause shock, blood poisoning, and death. The process involves physically removing the larvae, cleaning the wound thoroughly, and treating for infection. Here’s how to handle it step by step and what to watch for during recovery.
Why Speed Matters
Maggots don’t just sit on the surface. They burrow into tissue using rows of tiny hooks and spines, feeding on flesh as they go. As they feed, they release toxic secretions that can enter the bloodstream. An animal in the early stages of flystrike may seem restless and bite at the affected area. As it progresses, the animal becomes depressed, stops eating, stands with its head down, and separates from other animals. Without treatment, death can follow from toxic shock, tissue destruction, or overwhelming bacterial infection. Even a mild case causes rapid weight loss and weakened condition.
Step 1: Remove Visible Maggots
Start by clipping the hair or wool around the wound so you can see the full extent of the infestation. Maggots often spread wider than the visible wound suggests, so clip a generous margin around it. Using blunt-tipped tweezers or forceps, carefully pick out every larva you can see. Work slowly. Maggots grip tissue with hooks and spines, and crushing or tearing them apart inside the wound causes serious problems: leftover fragments trigger intense inflammation, bacterial infection, or hard lumps of scar tissue called granulomas.
For wounds with large numbers of maggots, flushing with a steady stream of saline or clean water helps dislodge larvae from crevices. A veterinarian may use a suction device to pull maggots out efficiently while keeping the area clean. If you’re in a remote setting without veterinary access, gentle irrigation with warm water and manual removal with tweezers is your best option.
Do not try to yank deeply embedded larvae out by force. A veterinarian can inject a local anesthetic at the base of the cavity where the larva sits. The swelling from the injection pushes the maggot to the surface, where it’s easy to grab and pull free without tearing it.
Step 2: Clean and Disinfect the Wound
Once all visible maggots are out, flush the wound thoroughly with saline or a dilute antiseptic solution. The goal is to wash away any remaining eggs, dead tissue, and bacteria. A veterinarian will typically debride the wound at this stage, meaning they trim away dead or damaged tissue to leave a clean surface that can heal properly.
After cleaning, apply a topical antiseptic or antibiotic ointment to the wound. For livestock, topical fly-repellent wound sprays are available that both treat the wound and discourage flies from returning. Daily wound dressing should continue until the area has closed. Eradicating any remaining eggs from the wound site is essential to prevent the infestation from recurring in the same spot.
Step 3: Treat for Infection
Any animal with a maggot infestation should be assessed for secondary bacterial infection. Maggot wounds are rarely clean. Your vet will likely prescribe a broad-spectrum antibiotic, with penicillin and oxytetracycline being common choices for livestock. An antiparasitic medication may also be given to kill any larvae that were missed during manual removal or that have migrated deeper into tissue.
Animals showing signs of toxic shock, such as extreme lethargy, refusal to eat, rapid breathing, or collapse, need more aggressive veterinary care including fluid support and close monitoring. These animals are critically ill.
Recovery Timeline
Once all larvae are removed and infection is under control, myiasis wounds typically resolve within 3 to 10 days, with an average of about 6 days. Deeper or more extensive wounds take longer. Most of these wounds heal by what’s called secondary intention, meaning the body fills in the cavity gradually from the bottom up rather than being stitched closed. Daily wound care with clean dressings and topical antibiotics continues through this period. After the wound closes, applying a topical antibiotic ointment for another week helps prevent surface infection as the new skin matures.
What Not to Use on Cats
This is critical: permethrin, a common insecticide found in many dog flea and tick products, is extremely toxic to cats. The ASPCA’s Animal Poison Control Center lists permethrin as one of the most common causes of poisoning in cats. Most cases happen when owners mistakenly apply a dog product to a cat, or when a cat grooms a recently treated dog. Cats exposed to permethrin can develop severe neurological symptoms and may need emergency care. If you’re treating a cat for maggots, avoid any product containing permethrin or pyrethroids unless it is specifically labeled as safe for cats.
Rabbits are similarly sensitive to many insecticides. Always check the label for species-specific safety information, and when in doubt, stick to manual removal and veterinary-prescribed treatments.
Treating Flystrike in Sheep and Livestock
Flystrike is one of the most common and economically devastating parasitic problems in sheep farming. The blowfly lays eggs in damp, soiled wool, particularly around the breech (rear end) and any open wounds. The hatching larvae can destroy large areas of tissue within hours.
For individual affected sheep, the treatment protocol is the same: shear the wool from the affected area, remove all larvae, clean the wound, and apply a topical insecticidal wound dressing. Animals showing signs of blood poisoning (depression, not eating, fever) need systemic antibiotics. Severely struck sheep that are in shock may not survive even with treatment, and humane euthanasia should be considered in those cases.
For flock-level prevention, chemical treatments applied to the wool provide a protective window against fly strike. The most widely used preventive in Australian sheep farming is dicyclanil, used by about 40% of producers, followed by cyromazine at 24%. Dicyclanil-based products can protect for up to 29 weeks under ideal conditions, though real-world protection is often shorter, sometimes dropping below 11 weeks. Alternative chemicals like spinosad and cypermethrin provide shorter windows of roughly 12 to 14 weeks. Keeping wool short, managing diarrhea (which attracts flies to the breech), and monitoring animals during warm, humid fly season are all essential parts of prevention.
Preventing Reinfestation
Flies are attracted to moisture, warmth, open wounds, and the smell of urine or feces on skin or fur. The single most effective prevention strategy is keeping your animal clean and dry. For pets, this means regular grooming, prompt treatment of any wounds, and keeping long-haired animals trimmed during warm months. Elderly, immobile, or incontinent animals are at highest risk because soiled fur creates an ideal egg-laying site.
For outdoor animals, fly-repellent sprays or pour-on treatments create a chemical barrier. Wound management is equally important: any cut, surgical site, or skin irritation should be kept clean and covered when possible. Check high-risk animals daily during fly season, paying close attention to the rear end, skin folds, and any existing wounds. Catching flystrike in the first few hours, before larvae have burrowed deep, makes the difference between a minor cleanup and a life-threatening emergency.