New state restrictions meant to stop the spread of the New World screwworm are now disrupting the cross-country transport networks that overcrowded shelters rely on to move dogs and cats to new homes, according to a report from Harvest Public Media published this week.

The parasite has been confirmed in just over 40 animals in Texas and New Mexico as of July 22, including three dogs, up from the single case Dog Friendly Las Vegas reported two weeks ago.

Nearly every state has added entry permits, veterinary inspection requirements, or preventive medication rules for animals traveling out of Texas or the areas around confirmed cases.

One Texas-based transport company told Harvest Public Media its usual weekly load of 30 to 40 dogs was cut in half last month as the new rules took hold.

The disruption matters well beyond Texas. Shelters across the South routinely transfer dogs to rescue partners in other states to ease overcrowding, the same kind of network Las Vegas rescues lean on when local shelters hit capacity.

We have covered how Southern Nevada cases, including this spring’s 114-dog Mesquite rescue, depended on partner organizations as far away as Utah to place animals once local shelters filled up.

Veterinary experts say the underlying prevention measures are straightforward, since common flea and tick medications can protect shelter animals before travel. The bigger obstacle is access.

Ellen Jefferson, president of Austin Pets Alive, told Harvest Public Media that more than 200 Texas shelters lack access to a veterinarian, making it difficult for them to get animals treated and documented in time to move.

Nevada has not issued a screwworm-specific travel order of its own, so the more immediate concern for Las Vegas dog owners remains the rules of any state they pass through when traveling, particularly Arizona, New Mexico, and Texas.

All confirmed U.S. cases still trace back to the first detection on June 3, 2026, and every current Infested Zone or Adjacent Surveillance Zone remains in Texas.

For Las Vegas rescues and shelters that place dogs through interstate transfer partners, the new rules are a reminder to confirm a partner organization’s current entry requirements before committing to a transport, since restrictions are being updated on a state-by-state basis and can change with little notice.