Rio Grande Valley
& Laredo Protection Dogs

In 2025 the Laredo port of entry recorded 5,157,634 personal vehicles coming into the United States, and the five Valley ports from Roma down to Brownsville recorded 11,554,713 between them, according to the Bureau of Transportation Statistics border crossing data. Those are northbound personal vehicles only, not people and not dogs, and the cars going south are not counted. If your dog will ever ride across, here is what each government now asks.

The rules arrived in layers. CDC’s Dog Import Form receipt applies to every dog coming into the United States, including dogs that live here. Screwworm was confirmed in Texas in June 2026, and on 26 June CBP reminded travelers that a dog crossing north needs a screwworm-freedom certificate, US-origin dogs returning after travel included. Mexico began requiring its own screwworm inspection certificate for dogs arriving from the United States on 3 August. The rest of this page sets out what it now takes, where a trained working dog is likelier than a pet to be caught out, and what the screwworm and rabies maps look like along the river as of October 2026.

Yes, with a microchip, the right age, a CDC receipt and two certificates, each with its own five-day limit; for the southbound one, APHIS does not say what the five days are counted from. Start with the part that is not a problem: Mexico is not on CDC’s list of high-risk countries for dog rabies, so a dog coming home from Mexico falls under the lighter low-risk rules rather than the stricter rules for high-risk countries, a list that includes Guatemala, Honduras and Brazil. The screwworm paper is what got heavier. Here is the whole list, going each way.

None of the rules above were written with protection dogs in mind. But a dog that does bite work, lives partly outdoors and rides in the family car every day meets them differently from a lapdog in a carrier, and the APHIS guidance is plain about the stakes: an animal suspected of screwworm may be denied US entry and returned to the country of departure at the owner’s expense.

On the last card: how a trained dog behaves around strangers it has not been asked to deal with is covered in our guide to whether a protection dog will bite without a suit, and our footage of a dog holding a down-stay on a city street shows the kind of public control it describes. If the dog will cross, say so on the first call.

One more thing we will not pretend to know. Once the dog is in Mexico, how a bite or a threat display is treated is a question of Mexican law, and we know Texas law, not theirs. If the dog will spend real time south of the river, ask a Mexican lawyer, not us. If it will fly rather than drive, the airline rules are a separate problem, set out in our guide to flying with a protection dog.

The USDA confirmed New World screwworm in a calf in Zavala County on 3 June 2026. The Animal Health Commission notes that screwworm had been eradicated from the United States in 1966. Five days later it confirmed a case in a dog, with samples submitted by a veterinarian in Andrews County, and said early reports indicated the dog had recently been in Mexico. That is the crossing this page is about, in one sentence from the federal government.

When we read the Texas Animal Health Commission’s screwworm page on 8 October 2026, it counted 17 Texas counties and 42 premises with cases, and listed movement restrictions in parts of twelve counties. Two are on this page’s stretch of river: Starr, at the western end of the Valley, and Zapata, between the Valley and Laredo. The order behind that zone, signed after a detection in a bovine in Starr County on 18 July, says warm-blooded animals inside it may not be moved out without prior authorization, must be inspected and treated, and need a permit or certificate to leave. A dog is a warm-blooded animal. The order calls unauthorized movement subject to administrative penalties or criminal prosecution.

The rest of the region was clear on that reading. An earlier zone covering parts of Jim Hogg, Starr and Zapata was released on 18 September, and the zone that took in part of Webb County was released on 31 August. Hidalgo and Cameron counties were not named. These lines move every few weeks, so if you live in the western end of the Valley, look your address up on the commission’s zone map before you plan to take the dog anywhere.

What it means day to day is attention to wounds. The commission tells owners to check body openings — nose, ears, genitals — for drainage, odour or swelling, to keep open wounds clean and covered, and to have pets inspected when travelling in infested areas. Left untreated, it says, an infested animal can die within a week. The FDA’s screwworm drug page, current as of 3 September 2026, lists a conditional approval and several emergency authorizations for products used in dogs. Which one, if any, belongs in your dog is a conversation with your vet, not with us.

South Texas is where the state fought canine rabies. The Department of State Health Services records 122 confirmed animal cases of the domestic dog/coyote variant in Texas in 1994, the first vaccine bait air drop in South Texas in 1995, and zero cases by 2000. Two cases followed, in 2001 and 2004, both confirmed within a mile of the Rio Grande and likely in wildlife that had crossed from Mexico. DSHS described the 2026 flights as the program’s 32nd annual, and announced in January 2026 that it would distribute roughly 693,600 baits at 50 per square mile over a 19-county Border Maintenance Zone that includes Webb, Zapata, Starr, Hidalgo, Cameron and Willacy, with hand baiting planned in parts of Cameron, Hidalgo, Starr and Willacy.

For a dog owner here, two things follow. First, the baits are not a threat: DSHS says a pet that eats one will not be hurt, and also that a bait cannot substitute for the rabies vaccine a veterinarian gives. Second, living inside a baiting zone does not excuse the dog from its own shot.

Under the state’s rabies quarantine rule, a dog that bites a person is confined for ten days whatever its vaccination status, and the local rabies control authority may allow that at home if several conditions are met, among them an approved secure enclosure, observation on the first and last days, and a dog that was not a stray. A current vaccination is one more condition: the rule lets an unvaccinated animal not over 16 weeks old be confined at home, while an older dog needs a current vaccination. The rest of what follows a bite is in our guide to Texas dog bite law.

Laredo is the shortest of these drives and the strangest county on this page. Webb County covers about 3,361 square miles of land in the Census Bureau’s gazetteer, more than Hidalgo (about 1,571) and Cameron (about 892) put together.

Outside the city, help is a long way off. In 2022 KGNS reported that the Webb County Precinct 3 constable’s office had eight people to cover more than 1,000 square miles, including Los Aguilares, Oilton, Mirando City and Bruni. That is a four-year-old figure about one office, not a statement about response times today, but it describes the geometry: on a ranch lot off a county road, the dog is the part of the plan that is already there. That changes the dog. A household on acreage can use more standoff and wants a dog that holds a boundary nobody fenced, and the honest problems — containment, livestock, snakes, a dog that hears a vehicle long before you do — are the ones in our guide to protection dogs on ranches and acreage.

I-35 out of Laredo runs through a Border Patrol traffic checkpoint, which the Laredo North Station page puts 29 miles north of the city, and the same page says service canines are deployed for checkpoint operations. From the Valley, US-281 passes the Falfurrias checkpoint, 13 miles south of that town. You do not need to cross the river to put your dog in a stopped car with an agent at the window.

The Valley is four counties wearing one name, and the details that matter for a dog differ between them. The land areas come from the 2020 gazetteer, the crossing counts from BTS for 2025, the port names from CBP, and the rabies and screwworm status from the DSHS and TAHC documents linked above. Willacy County, the quiet fourth, appears on this page only as part of the rabies zone.

One condition is common to all of it. In 2024 The Texas Tribune reported an estimate, presented to Hidalgo County officials by a local rescue, that 750,000 to 1,000,000 animals roam the Valley’s streets, and the same rescue’s estimate of at least 860 colonias with 60 to 100 stray dogs each. Those are advocacy figures, not a census, and the same article puts Houston’s stray count higher. What they mean for a family protection dog in Edinburg or Harlingen is practical: a loose dog trotting up on the evening walk is likely enough to plan for, a dog-on-dog fight is not what this animal is for, and on that street a dog that ignores other dogs is worth more than one with a harder bite.