Screwworm and Dogs: What U.S. Pet Owners Need to Know
Pet owners in the United States may have recently heard more about New World screwworm, a parasite that can cause serious wounds in animals. The topic has received increased attention as officials monitor its spread and movement across regions.
For dog owners, the important thing is not to panic. Instead, understanding what screwworm is, how it affects animals and what warning signs to watch for can help you protect your pet.
What Is New World Screwworm?
New World screwworm is a type of fly whose larvae can infest the wounds of warm-blooded animals.
Unlike ordinary flies, screwworm larvae can invade living tissue. An infestation is known as myiasis and can become serious if it isn't treated.
Dogs that spend significant time outdoors may potentially encounter the parasite, particularly in areas where screwworm activity has been identified.
The parasite is different from the common flies and insects that pet owners normally see around their homes.
How Does Screwworm Affect Dogs?
Adult female screwworm flies can lay eggs in or around wounds and other vulnerable areas of an animal.
After the eggs hatch, larvae can enter the wound and feed on living tissue. As the infestation progresses, the wound may become larger and more painful.
This is why checking your dog regularly—especially after outdoor activities—is important.
A small cut, scratch or bite should not automatically be assumed to be screwworm. Dogs can develop wounds for many ordinary reasons. However, unusual or worsening wounds deserve veterinary attention.
Warning Signs Pet Owners Should Watch For
The symptoms can vary depending on the location and severity of the infestation.
1. A Wound That Gets Worse
One of the most important warning signs is a wound that appears to become increasingly painful, swollen or damaged instead of healing normally.
Pay attention to wounds that seem unusually deep or continue getting larger.
2. Unusual Discharge or Odor
An infected or infested wound may produce discharge or develop an unusual smell.
If a wound has a strong odor or appears significantly different from when you first noticed it, contact your veterinarian.
3. Excessive Licking
Dogs naturally lick minor injuries, but persistent licking can indicate pain or irritation.
If your dog repeatedly focuses on one wound or area of the body, inspect it carefully.
4. Restlessness or Signs of Pain
A dog with a painful wound may become restless, avoid being touched or behave differently from normal.
Some dogs may also become quieter than usual or lose interest in normal activities.
5. Visible Larvae or Maggots
Finding larvae in a wound is an important reason to seek veterinary care immediately.
Not every maggot found around an animal indicates screwworm, so identification should be left to veterinary professionals.
Which Dogs May Have Greater Exposure?
Outdoor exposure can increase the chance of encountering parasites.
Dogs that frequently:
Hike or camp
Explore wooded or grassy areas
Spend significant time outdoors
Travel between regions
Have untreated wounds
Roam freely outdoors
may have greater opportunities for exposure.
However, this does not mean that every outdoor dog is at high risk.
The actual risk depends heavily on geographic location, local parasite activity and the dog's circumstances.
How Can You Protect Your Dog?
The simplest protection is regular inspection and good wound care.
After outdoor activities, check your dog from head to tail. Look carefully around the ears, face, neck, legs, paws and other areas where injuries may be difficult to notice.
If you find a cut or wound, keep it clean and contact your veterinarian if it appears serious, becomes worse or shows signs of infection.
Keeping your dog's routine veterinary care up to date is also important.
Don't Ignore Small Wounds
One of the most useful habits for pet owners is checking even minor injuries.
Dogs can get scratches from playing, running through vegetation, interacting with other animals or simply exploring outdoors.
A small wound may initially look harmless, but monitoring it allows you to notice changes early.
If the wound becomes swollen, painful, develops discharge or fails to heal normally, veterinary evaluation is appropriate.
What Should You Do If You Suspect Screwworm?
If you believe your dog could have a screwworm infestation, contact a veterinarian as soon as possible.
Do not attempt to dig larvae out of a deep wound yourself. A veterinarian can examine the wound, remove affected tissue or larvae as necessary and determine the appropriate treatment.
If you are traveling with your dog, tell the veterinarian where your pet has recently been.
Travel history can be useful when evaluating unusual parasites or infections.
Is Screwworm a Reason to Stop Taking Your Dog Outside?
Not necessarily.
Outdoor exercise is an important part of many dogs' lives. Instead of avoiding the outdoors completely, pet owners should focus on sensible precautions.
Check your dog after outdoor activities, prevent unnecessary roaming and pay attention to any wounds.
If local authorities or veterinary professionals issue specific guidance for your area, follow those recommendations.
Can Screwworm Affect Humans?
New World screwworm can also affect humans, although animal cases are an important concern.
People should avoid handling suspicious wounds or larvae unnecessarily. If you notice a concerning wound on yourself or a family member, seek medical advice.
For pet owners, the key message is simple: don't ignore unusual wounds on animals or people.
Frequently Asked Questions
Is screwworm the same as ordinary maggots?
No. Several types of flies can produce larvae that resemble maggots. New World screwworm is a specific parasite whose larvae can invade living tissue.
Can indoor dogs get screwworm?
Dogs that spend little time outdoors may have less exposure, but risk depends on location and circumstances. Regularly checking your pet for wounds is still a good habit.
How can I prevent screwworm in my dog?
Regularly inspect your dog for wounds, prevent roaming, address injuries promptly and follow veterinary or local public-health recommendations in areas where screwworm activity is a concern.
Should I remove larvae from a wound myself?
No. If you see larvae or a suspicious infestation, contact a veterinarian rather than attempting to treat a deep wound yourself.
Is every infected wound screwworm?
No. Many different conditions can cause wounds, discharge, swelling or larvae around an animal. A veterinarian should determine the cause.
Final Thoughts
New World screwworm is a serious parasite, but awareness is more useful than panic.
Dog owners can take simple precautions by checking pets regularly, paying attention to wounds and seeking veterinary help when an injury looks unusual or fails to heal.
If your dog develops a worsening wound, unusual discharge, significant pain or visible larvae, contact a veterinarian promptly.
Keeping your pet's wounds clean, limiting unnecessary outdoor exposure in affected areas and following local veterinary guidance can help keep your four-legged family member safer.
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