The United States Department of Agriculture (USDA) updated its policy for pet owners traveling to Mexico with their dogs and once again allowed border crossings, after temporarily including dogs on a list of animals subject to restrictions due to the spread of the New World screwworm.

However, animal health specialists warn that the measure does not eliminate the risks associated with the outbreak that affects Mexico and areas of the southern United States.

The modification was announced by the Animal and Plant Health Inspection Service (APHIS), dependent on the USDA, which specified that companion dogs can re-enter Mexico “in accordance with previously established procedures,” while the final update of the health requirements is concluded.

The decision reverses a temporary provision issued at the beginning of June, when the USDA suspended the export of several animal species to Mexico after the detection of cases of screwworm in United States territory. Among the animals initially affected were pet dogs, although the restriction was lifted a few days later.

Veterinary examinations and health certification

According to current regulations, dogs returning from Mexico to the United States must meet specific requirements related to the absence of screwworm.

The USDA indicates that animals coming from countries considered affected by this pest, including Mexico since November 2024, must have a veterinary certification proving that they are free of the disease.

The agency also recalls that Mexican health authorities carry out pet inspections at points of entry into the country through the National Agri-Food Health, Safety and Quality Service (SENASICA).

According to animal shelter workers on the border, many owners regularly cross into Mexico to obtain veterinary care at lower costs than those available in the United States. However, the current epidemiological situation has generated new concerns among specialists.

What is the screwworm and

The New World screwworm is a parasitic fly larva that lays its eggs in open wounds or natural cavities of warm-blooded animals. When they hatch, the larvae feed on living tissue, causing deep lesions that can be fatal if not treated promptly.

The USDA warns that the pest mainly affects livestock, wildlife and pets, although it can also infect humans in rare cases. The agency maintains a national surveillance and control strategy against the advance of the parasite from Central America to Mexico and the southern United States. Concern increased this month after US authorities confirmed the first cases of screwworm in the US in decades. Among them is a dog detected in the state of New Mexico, in addition to several cases in cattle in Texas.

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