New Travel & Animal Import Rules Between the U.S. and Mexico Due to New World Screwworm

If you’re planning to travel from the United States to Mexico with animals—or you’re involved in agriculture, veterinary care, or animal rescue—there are important new regulations you should know about.

The changes are the result of the detection of New World Screwworm (NWS) (Cochliomyia hominivorax) in the United States. This flesh-eating parasite poses a serious threat to livestock, wildlife, pets, and, in rare cases, humans. To help prevent its spread, the Mexican government has implemented new import restrictions on certain animals originating from the U.S. (Servicio de Inspección de Sanidad Animal y Vegetal)

Animals Currently Affected

Mexico has temporarily prohibited the import of several animal species from all U.S. states, including:

* Cattle (for slaughter and breeding) * Captive wild ruminants (non-bovine) * Horses and other equines (including breeding, work, sport, exhibition, and slaughter animals) * Sheep and goats * Breeding swine * Ferrets (both pets and commercial) * Commercial songbirds, ornamental birds, and raptors * Various zoological species listed by Mexico’s import regulations. (Servicio de Inspección de Sanidad Animal y Vegetal)

Important Update for Pet Owners

Beginning August 3, 2026, travelers bringing pet dogs or pet birds from the United States into Mexico must present New World Screwworm inspection documentation completed by a USDA-accredited veterinarian before travel. These inspections help verify that the animal shows no evidence of screwworm infestation and meets Mexico’s entry requirements. (Servicio de Inspección de Sanidad Animal y Vegetal)

At this time, pet cats are not subject to the new New World Screwworm inspection requirement, although they will still undergo routine inspection by Mexican agricultural authorities upon arrival. (Servicio de Inspección de Sanidad Animal y Vegetal)

Why These Measures Matter

New World Screwworm is not an ordinary fly. Its larvae invade living tissue through open wounds, causing severe infections that can be life-threatening if left untreated. While outbreaks primarily affect livestock, dogs, wildlife, and other warm-blooded animals are also susceptible. Preventing the parasite’s spread protects animal health, food production, and international trade. (AP News)

Before You Travel

If you’re traveling to Mexico with a pet dog or bird:

* Schedule an appointment with a USDA-accredited veterinarian well before your departure. * Verify the latest entry requirements before traveling, as regulations may change. * Carry all required inspection and health documents with you when crossing the border.

The official USDA Animal and Plant Health Inspection Service (APHIS) Pet Travel website provides the most current information and required forms.

For the latest official guidance, visit: USDA APHIS Pet Travel – U.S. to Mexico

Staying informed and preparing ahead can help ensure a smooth trip while supporting efforts to protect both U.S. and Mexican animal populations from the spread of New World Screwworm.