06/12/2026
Screwworm was found in a dog in Texas. What does that mean for your pets?
Texas Public Radio | By Jayme Lozano Carver | The Texas Tribune
Published June 11, 2026 at 5:07 PM CDT
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Yes, your pets are susceptible to screwworm, but veterinarians say it is treatable.
Olivia Anderson
/
The Texas Tribune
Yes, your pets are susceptible to screwworm, but veterinarians say it is treatable.
LUBBOCK — The New World screwworm has burrowed itself into Texans’ consciousness after the U.S. Department of Agriculture confirmed seven cases — six in Texas and one in New Mexico — in the last week.
After hearing the horrendous way it affects livestock, many were left asking: What about my fur baby?
The parasitic fly targets animals with wounds and lays its eggs in any openings, leaving the eggs to hatch into maggots and burrow into the animal to feed on living flesh. It is notorious for devastating the cattle and livestock industry and, so far, cases have been caught in young calves and a goat in South Texas. However, a dog from New Mexico that visited Andrews County in West Texas also has a confirmed case of the screwworm.
“It’s not a time to panic,” said Guy Loneragan, dean and professor for the Texas Tech University School of Veterinary Medicine. “We have been preparing for this for almost 18 months or longer in many cases, and there is a plan to address it.”
Local, state and federal officials are working to track screwworm cases and containment efforts, including the release of sterile flies to mate with the screwworm so she will lay unfertilized eggs. Experts, including U.S. Agriculture Sec. Brooke Rollins, say the screwworm outbreak may continue for a few months at least.
Since the New World screwworm targets any warm-blooded mammal, including humans, pets are at risk of screwworm infestation.
Here are some things pet owners need to be aware of:
Can screwworms affect my cat or dog?
Short answer: yes. The screwworm can affect all warm-blooded animals and in different ways. For example, the screwworm tends to infect any open wound on an animal. For pet owners, this could be any regular, everyday wound, such as tick bites, small scrapes and cuts from being outside, or if their cat or dog gets into a fight with another animal.
It can also invade any openings on the body — the mouth, eyes, nose, even the reproductive areas. The screwworm will lay eggs on the edge of the wound or opening, which hatch quickly and become maggots. One female can lay 200-300 eggs at a time, and may lay up to 3,000 eggs during her 10- to 30-day lifespan.
“There are lots of areas that can become infested,” said Loneragan.
According to Texas A&M AgriLife, the maggots have sharp mouth hooks that can tear at the tissue of the animal it’s in. The wound becomes larger and deeper as more eggs hatch and larvae continue to feed on the animal. The infestation could be fatal for dogs and cats, depending on the location of the infestation and the severity, along with the timing of the diagnosis.
Loneragan said birds can also become infested, but it’s not very common.
“That’s beneficial to us because it means that migrating birds aren’t moving this around to the best of our knowledge,” Loneragan said.
What symptoms should I look for?
If an animal becomes infected, owners will know based on how the animal acts. The maggots feeding into their flesh causes discomfort and intense pain in some cases. There may be some discharge coming from the infected area that can help pet owners identify the infection.
“The animals will demonstrate they are uncomfortable or a wound is causing a lot of pain,” Loneragan said. “Discharge coming from the area is described as having a foul, putrid smell.”
Other signs include seeing animals bite or lick at their wounds, and unusual restlessness. In some cases, according to A&M AgriLife, the animal may become aggressive or lethargic from irritability.
When should I take my pet to see a veterinarian?
Pet owners who suspect a case in their cats or dogs should contact their local veterinarian and the Texas Animal Health Commission right away.
Loneragan said the Food and Drug Administration has made certain medicines available, including antiparasitic chewable tablets or topical solutions, to veterinarians to treat both dogs and cats. In the rare case that either a wild bird or a pet bird does get infected by the screwworm, there are FDA-approved antiseptic products to treat them too.
Is screwworm treatable?
Yes, as long as the infection is caught and treated early. Loneragan said that pet owners need to report any suspicions or concerns they have to their veterinarian. The veterinarian can come up with a treatment plan that best fits the animal, the type of wound they have, and where it is.
“Treatment generally will involve removing the larvae, then using a product that would kill any remaining larvae that is too small to see or can’t be seen,” Loneragan said.
Larvicides and insecticides are two products that help veterinarians treat the infections after the maggots are removed. Screwworm may seem scary, especially given its prominence in the media, but Loneragan said the parasite is treatable. Moreover, veterinarians have tools available to treat a wide variety of animals, he said.
“Ultimately, the sooner you can get to the veterinarian, there are excellent treatment options they can prescribe and implement,” Loneragan said.
How can I keep my pets safe?
The most vital thing pet owners can do during this screwworm outbreak is to be extra vigilant and check their animals every day. Owners should inspect their pets for any wounds or openings that could be vulnerable to the screwworm. Keep pets clean and make sure there aren’t any insects, flies or maggots laying on them.
Loneragan said this is also an important time to establish a good relationship with your local veterinarian, if you don’t have one already. Veterinarians will help diagnose and report cases, which will also help officials track where the screwworm is. Many of the treatments also have to be prescribed by a veterinarian.
Texas A&M AgriLife recommends that if a pet is near the U.S.-Mexico border, or traveling to or from Latin America, then that pet should be monitored more regularly. It’s also recommended to use flea, tick and mite medications as needed for parasite management.
There are some scenarios, such as the screwworm flying inside a home, that can only be avoided through fly control techniques.
“They’re a fly. They’re going to move around and can fly between spaces or in spaces,” Loneragan said. “Implement the usual fly control in the house you would normally do, whether it’s a fly swatter or whatever. At that stage, you would be going after all flies.”
Is it contagious?
The infection from a New World screwworm is not contagious like the common cold. Loneragan said just because one pet has it does not necessarily mean another in the house might get it.
However, owners should be extra vigilant if they have multiple pets. For example, a household with more than one dog might have a situation where the dogs fight and scratch each other.
“Now you’ve got two dogs that you really ought to pay close attention to while those wounds are healing,” Loneragan said.
What about stray animals and wildlife?
Stray animals are more susceptible to open wounds and are vulnerable because they live outside, so it’s important that caretakers of stray cats or dogs are also checking for signs of an infection. Similar to inside pets, stray animals will show pain or may have discharge around the wound. If any symptoms are found, Loneragan says to call the local animal control to report it.
“Those things ought to be brought to the attention of animal control very quickly,” Loneragan said. “They can work with the veterinarians they usually do to address it and can implement the same sort of treatment plans if appropriate.”
If you suspect a case of the screwworm in wildlife, don’t approach the animal any closer than 25 yards and report the sighting to the local Texas Parks and Wildlife Department or to the Texas Animal Health Commission. According to A&M AgriLife, commonly infested areas of wildlife include the head and neck, along with the umbilical region for newborn animals. Deer are also susceptible to infestation where their antlers shed from their skull or if their antlers are damaged while they grow.
Birthing season for wildlife can also put female animals and their young at risk for infection, causing high mortality for both. Screwworm also has the potential to severely reduce the population of large mammals, such as the white-tailed deer, mule deer and bighorn sheep.
