Drivers who cross the southern border should be aware of pet requirements enacted to prevent the spread of New World screwworm.
On June 26, 2026, U.S. Customs and Border Protection (CBP) shared guidelines for drivers who travel across the U.S./Mexico border with dog companions on board amid concerns about the threat of the flesh-eating parasite screwworm.
Officials said that all dogs gaining entry from Mexico to the U.S., including U.S.-origin dogs, must comply with USDA Animal and Plant Health Inspection Service (APHIS) and Centers for Disease Control (CDC) and Prevention requirements.
Officials say that CBP will “strictly enforce these requirements and take action to prevent the smuggling of live animals, including dogs.”
“Protecting the health of animals and the public is a top priority for CBP,” said Acting Director, Agriculture Programs and Trade Liaison Timothy Lacasse. “By enforcing these requirements, we help prevent the introduction and spread of dangerous pests and diseases, ensuring the safety of our communities and livestock.”
See below for specific requirements outlined by CBP.
USDA APHIS Entry Requirements for Dogs:
- Dogs may enter the United States if they appear healthy and are accompanied by a certificate issued by a full-time, salaried official government veterinarian of the region of origin. The certificate must state that the dog:
- Has been inspected for screwworm within five days before shipment to the United States, and
- Is either free from screwworm or
- Was infested with screwworm, held in quarantine, and treated until free from screwworm before leaving the region.
- Travelers are strongly encouraged to carry recent veterinary records demonstrating their animal’s health
- Requirements may change; for the latest information, visit USDA APHIS Pet Travel.
CDC Entry Requirement for Dogs for dogs from Mexico:
- All dogs entering or returning to the U.S. must be accompanied by a CDC Dog Import Form receipt. Additionally, dogs must meet the following conditions:
- Must appear healthy (e.g., free of lesions or wounds),
- Be 6 months of age, and
- Be microchipped.
- Requirements may change; for the latest information, visit CDC Bringing a Dog into the U.S.