New Mexico Dog Tests Positive for Flesh-Eating Screwworm-Here's What Pet Parents Need to Know
On June 3, the U.S. Department of Agriculture's Animal and Plant Health Inspection Service confirmed the first case of the New World screwworm in the United States in more than 50 years.
The parasite, which targets mainly farm animals, hasn't been much of a concern among pet parents, but with the USDA confirming the first case in a family dog on Monday, June 8, that might change.
The United States eliminated the screwworm in 1966 following one of the most ambitious sterile insect programs in history.
Sadly, it is back now.
This Isn't An Ordinary Parasite
There is a difference between this parasite and the most commonly known among pet parents. Called New World screwworm, unlike many fly larvae that feed on dead tissue, this one feeds on living flesh.
Adult female flies lay eggs in open wounds, cuts or surgical sites. After hatching, these parasites burrow deeper into the animal's healthy tissue to feed.
That makes the screwworm one of the most serious livestock and animal health threats in the United States.
A Single Dog Case Is Getting National Attention
The recent case involved a dog in Lea County, N.M.
According to the official statement, the dog recently visited Texas before the infestation was discovered. The USDA says the dog is currently recovering, and surveillance teams have visited the site to check for additional cases nearby.
So far, this sounds like an isolated case. Still, that doesn't mean you shouldn't remain vigilant.
A parasitic fly does not respect state lines. It took years to spread from Panama through seven countries before finally reaching Texas and New Mexico. Nobody can say for sure where the spread of the New World screwworm will end.
Related: Vet Reveals the 'Coffee Grounds' Trick to Spotting Fleas Instantly-and It's Actually Genius
Most People Don't Understand How Serious This Is
The screwworm does not distinguish between livestock and pets. They can reach cattle and family dogs simultaneously.
The infestation can go from invisible to severe within 48 hours. By the time most pet parents notice something is wrong, the wound can be worse than it appears.
How to Keep Your Dog Safe
If you own a dog in New Mexico, Texas, or anywhere near the U.S.-Mexico border, you should pay even closer attention to the situation.
Start by keeping your dog's open wounds clean and covered. If you notice visible maggots around the wound, a foul or unusually strong odor from the wound, or unexplained bleeding, immediately call your vet.
Dogs may also show loss of appetite and separate themselves from other animals or their pet parents.
Right now, awareness is the best defense. The good news is that the dog in New Mexico will recover, and officials consider it an isolated case.
And while many pet parents might never encounter screwworm, understanding the parasite and how it spreads can make the difference.
Early detection can save your dog's life.
Related: Vets Issue Urgent Warning for Dog Owners as Tick Season Arrives Early in These States
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This story was originally published June 9, 2026 at 11:48 AM.