Two cases of New World screwworm in dogs are among more than 30 confirmed instances in Texas and New Mexico, prompting warnings from veterinarians and humane societies that pet owners need to remain vigilant to protect their animals. This was reported by Qazaqyia.kz citing Associated Press.
The parasite reappeared in cattle in the U.S. in June 2026, more than 50 years after it had been largely eradicated from the country. The pest is actually the larvae of the New World screwworm fly. It eats live flesh and fluids rather than dead material, as the larvae of most fly species do.
The fly's migration north from Panama starting in 2024, and through Mexico in 2025, has agriculture officials warning that it poses a threat to the $113 billion U.S. cattle industry, but the larvae can hatch and breed in any mammal, including wildlife, dogs, cats and occasionally humans.
The problem develops when a female fly lays its eggs in open wounds and mucous. After the eggs hatch, the larvae feed for about a week before maturing, dropping to the ground and continuing to develop into an adult fly.
To protect pets, the following measures are recommended: keep wounds clean, regularly inspect animals, and consult a veterinarian.