New travel regulations could impact Arizonans who plan to journey with their pets as the New World screwworm continues to make its presence felt in the region. Currently, six cases have been confirmed in both livestock and dogs within Arizona.
The identified cases have primarily been found in the rural southeastern areas of the state.
Arizona authorities have marked three specific infested zones, where live animals are restricted from leaving a 12.4-mile radius unless cleared by the State Veterinarian.
Outside these zones, individuals planning to transport dogs or other warm-blooded pets from Arizona to California, Florida, or Mexico will likely require a veterinary certificate proving the absence of a New World screwworm infection.
Mindy Bemmerl, Director of Veterinary Medicine at the Arizona Humane Society, advises residents to prepare ahead. “Just make sure that everything is in order before traveling,” Bemmerl stated. “So making sure that your veterinarian is able to and willing to write one of those health certificates, making sure you have enough time before you are traveling to get all of this done.”
The screwworm is transmitted by flies depositing eggs in animal wounds. Bemmerl recommends monthly flea and tick medications to help prevent infestation.
California’s New World Screwworm Requirements:
As per the California Department of Food and Agriculture, any warm-blooded animal from a state with active screwworm zones, including Arizona, must undergo inspection before entering California as of June 12, 2026.
Animals hailing from Arizona’s infested regions need an electronic veterinary certificate within five days of arriving in California, whereas those from other parts of Arizona need one within seven days.
Additionally, a California Entry Permit is required, obtainable through contact via [email protected], [email protected], or 909-247-8789.
Florida’s New World Screwworm Regulations:
The Florida Department of Agriculture and Consumer Services mandates that all warm-blooded animals from Arizona traveling to Florida must have a valid Official Certificate of Veterinary Inspection as of Oct. 29, 2026. This document must certify that animals are free from contagious diseases and pests, including the New World screwworm, and is valid for five days post-inspection.
Shelter animals from Arizona are currently prohibited from being brought into Florida.
Mexico’s New World Screwworm Entry Requirements:
According to the U.S. Department of Agriculture, Mexico requires screwworm inspection documents for pet dogs and birds entering the country as of Aug. 3, 2026. Inspections must occur within five days prior to entry, and inadequate documentation may lead to denial of entry or detainment at the border.
For frequent travelers between the U.S. and Mexico with dogs, registration for Mexico’s Frequent Traveler Pet Program is available.
Dogs originating from the U.S. and returning from Mexico must provide a screwworm-free certificate issued by an authorized veterinarian within five days before re-entry. A list of such veterinarians in Mexico is accessible on the Mexican government’s website.
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