Have you ever wondered if a seemingly healthy dog or cat could develop a serious screwworm infestation? With recent attention focused on the return of this dangerous parasite in parts of North America, many pet owners are asking exactly how pets get screwworms and what they can do to protect their furry companions. At Pet Doctor, your Heath, TX veterinary clinic, understanding emerging health threats is an important part of helping pets stay safe and healthy. Knowing how screwworm infestations begin can help you identify potential risks before they become medical emergencies.

The answer often starts with something surprisingly small. A minor cut, a scratch, a hot spot, or another skin injury can create an opportunity for infestation. Understanding how to prevent screwworm infestations in pets, practicing good pet wound care, learning about the flesh-eating screwworm fly, and recognizing potential risks from New World screwworm can help you make informed decisions about your pet’s health and well-being.

What Is a Screwworm?

Before understanding how pets become infected, it helps to understand what a screwworm actually is.

The New World screwworm is the larval stage of the parasitic fly Cochliomyia hominivorax. While adult flies resemble many common fly species, their offspring behave very differently from typical maggots.

Most fly larvae feed on dead tissue or decaying material. Screwworm larvae feed on living tissue. This unique behavior makes the parasite particularly dangerous to animals.

Once larvae hatch and begin feeding, tissue damage can progress quickly without veterinary treatment. Infestations can also spread very quickly, which is another cause for concern.

How Pets Get Screwworms

The process begins with an adult female screwworm fly searching for a suitable location to lay her eggs.

Unlike flies that are attracted to garbage or decaying material, the female screwworm seeks out living animals with wounds or damaged skin. Once she finds an appropriate location, she deposits eggs near the wound.

Within a relatively short period, the eggs hatch and the larvae begin feeding on nearby tissue.

This feeding causes the wound to enlarge and creates additional tissue damage, allowing the infestation to progress.

Understanding this cycle is key to understanding how pets get screwworms and why prevention focuses heavily on wound management.

Why Wounds Attract Screwworm Flies

The female fly relies on scent and moisture to locate suitable sites for egg laying.

Open wounds release odors and fluids that naturally attract the fly. Even relatively minor injuries may be appealing if they provide access to tissue.

The fly is not necessarily looking for a severe injury.

In some cases, wounds that seem insignificant to pet owners may still create an opportunity for infestation.

This is one reason veterinarians emphasize prompt attention to all skin injuries, regardless of size.

Common Wounds That Can Increase Risk

Many different types of wounds can potentially attract screwworm flies.

Cuts and Scrapes

Dogs and cats frequently experience minor cuts during everyday activities.

Running through brush, climbing fences, rough play, and outdoor adventures can all lead to small injuries.

These wounds often heal uneventfully, but they should still be monitored carefully.

Surgical Incisions

Surgical sites require special attention.

Spay and neuter procedures, lump removals, orthopedic surgeries, and other procedures create healing incisions that should be inspected regularly during recovery.

Following all post-operative instructions helps reduce complications and supports proper healing.

Bite Wounds

Animal bites frequently create punctures and tissue damage that may not be fully visible on the surface.

Because bite wounds often contain bacteria and may close prematurely, veterinary evaluation is often recommended.

These injuries can create environments that attract flies if not properly managed.

Hot Spots

Hot spots are areas of inflamed, irritated skin that may develop when pets scratch, lick, or chew excessively.

These moist lesions can worsen quickly and may attract flies if left untreated.

Prompt veterinary care can help address both the hot spot and the underlying cause.

Can Skin Conditions Increase Screwworm Risk?

Yes.

Skin conditions are among the most overlooked risk factors associated with screwworm infestations.

Pets experiencing chronic skin irritation may create wounds through scratching, licking, and chewing.

Conditions that may contribute include:

• Environmental allergies
• Food allergies
• Ear infections
• Flea allergy dermatitis
• Skin infections
• Chronic itching disorders

The more damage occurring at the skin surface, the greater the potential opportunity for flies to lay eggs.

This is why managing skin conditions is an important part of preventing screwworm infestations in pets.

Which Pets Are Most Likely to Be Exposed?

Not every pet faces the same level of risk.

Lifestyle and environment play important roles in determining opportunities for exposure.

Outdoor Dogs

Dogs that spend significant time outdoors naturally encounter more environmental hazards.

Working dogs, hunting dogs, ranch dogs, and highly active pets may experience increased exposure to both injuries and flies.

Outdoor activities remain beneficial for many dogs, but regular inspections become especially important.

Outdoor Cats

Cats that roam outdoors may encounter thorny vegetation, fences, wildlife, and other potential sources of injury.

Because cats are skilled at hiding discomfort, wounds sometimes go unnoticed until they become more advanced.

Regular hands-on examinations can help identify concerns early.

Pets Living Near Livestock

While companion animals can develop screwworm infestations, livestock populations often receive significant attention during outbreaks.

Pets living on farms, ranches, or rural properties may have greater opportunities for exposure simply because of their environment.

This does not mean urban pets are immune, but environmental factors can influence risk.

Can Indoor Pets Get Screwworms?

Many owners assume indoor pets are completely protected.

Indoor living generally reduces exposure, but it does not eliminate every possible risk.

Pets that undergo surgery, develop skin conditions, or occasionally spend time outdoors may still experience situations that create opportunities for infestation.

A healing surgical incision on an indoor pet still deserves close monitoring.

Good pet wound care remains important regardless of where your pet spends most of its time, regardless of whether any infestations are happening.

Why Early Wound Care Is So Important

The simplest way to reduce risk is to address wounds promptly.

A clean, healing wound is far less attractive than one that is inflamed, infected, or neglected.

Inspect Injuries Daily

If your pet has a wound, make it a habit to check it regularly.

Look for:

• Swelling
• Redness
• Drainage
• Odor
• Increased irritation

Changes in appearance often provide valuable clues about how healing is progressing.

Follow Veterinary Instructions

Whenever a veterinarian provides wound care recommendations, consistency matters.

Following those instructions helps support healing while reducing the risk of complications.

This becomes especially important after surgical procedures.

Understanding New World Screwworm Risks

The recent attention to screwworms has understandably caused concern among pet owners.

Fortunately, awareness is one of the most effective tools available.

Understanding New World screwworm risks does not mean becoming fearful of every scratch or scrape. Instead, it means recognizing situations that deserve closer attention.

Knowledge allows you to act quickly if concerns arise.

Prompt action often makes a significant difference in outcomes.

What Happens If a Fly Lays Eggs?

Once eggs hatch, larvae begin feeding on surrounding tissue.

Unlike common maggots that consume dead tissue, screwworm larvae continue feeding on healthy flesh.

As the infestation progresses, you may notice:

• Enlarging wounds
• Excessive licking
• Foul odor
• Swelling
• Pain
• Visible larvae

These symptoms require immediate veterinary attention.

Because tissue damage can progress rapidly, delaying treatment is never advisable.

How Veterinarians Help Protect Pets

Veterinarians play a critical role in both prevention and treatment.

Regular wellness exams allow veterinarians to identify skin issues, discuss parasite risks, and address wounds before complications develop.

Veterinary teams can also guide regarding:

• Wound management
• Post-surgical care
• Skin health
• Parasite prevention
• Environmental risk reduction

A proactive approach is often the most effective strategy.

Practical Ways to Reduce Risk

Protecting your furry friend starts with everyday habits.

Regular grooming and routine physical checks make it easier to spot problems early.

Pay special attention to:

• Skin folds
• Ears
• Paws
• Belly
• Surgical sites
• Areas beneath thick fur

The earlier you identify a wound, the sooner appropriate care can begin.

These simple habits support both comfort and overall health.

Agrilife Today is also hosting some public awareness events about the screwworm. The AAHA also has some educational articles about how the screwworm endangers pets.

FAQ

How do pets get screwworms?

Pets get screwworms when female screwworm flies lay eggs in wounds, damaged skin, or other vulnerable areas. After hatching, the larvae begin feeding on living tissue.

What types of wounds attract screwworm flies?

Cuts, scrapes, bite wounds, surgical incisions, hot spots, skin infections, and other damaged skin areas may attract screwworm flies. The flies can also infest mucous membranes, such as the eyes and nose.

Are indoor pets at risk for screwworm infestations?

Indoor pets generally face lower risks, but wounds, surgical sites, and skin conditions can still create opportunities for infestation if exposure occurs.

How does pet wound care help prevent screwworm infestations?

Proper pet wound care promotes healing, reduces inflammation, and helps limit conditions that may attract flies.

What are common New World screwworm risks for pets?

Common New World screwworm risks include untreated wounds, chronic skin irritation, outdoor exposure, surgical recovery, and delayed treatment of skin problems.

Schedule an Appointment at Our Heath, TX Veterinary Clinic

Understanding how pets get screwworms is one of the best ways to protect your furry friend from this serious parasite. At Pet Doctor, your Heath, TX animal hospital, veterinary teams can help evaluate wounds, discuss preventing screwworm infestations in pets, provide guidance on pet wound care, and address concerns about New World screwworm risks. If you’ve been searching for a vet near you and have questions about your pet’s skin health or a wound that isn’t healing properly, schedule an appointment today.

This blog is intended for informational purposes only. Always consult your veterinarian for medical advice, diagnosis, and treatment recommendations specific to your pet. Follow your veterinarian’s guidance regarding wound care, parasite prevention, and overall health management.

To discover more about the care available at our Texas animal hospital, explore our Services page. You’ll find information about our wellness care, surgery, and much more.