Among the many security measures surrounding World Cup matches in North Texas, some of the most critical are working on four legs. They’re called “vapor wake” dogs — highly trained K-9s capable of detecting explosives not just in bags or objects, but on people moving through a crowd.

Meet Arlo, a vapor wake dog

One of those dogs is Arlo. He’s assigned to the World Cup “Dallas Stadium” in Arlington alongside his handler, Arlington Fire Department bomb technician Manuel Carrillo. Together, they move through dense crowds, searching for threats others might miss.

“We’ll walk and kind of weave our way through the crowd so that we can identify anything that’s at risk,” Carrillo said. Unlike traditional detection dogs, “vapor wake” K-9s are trained to detect even trace amounts of explosives in the invisible trail left behind as a person walks.

“That would be identifying any type of person that may have any type of explosive on them, be it backpacks, purses, any of that or even a suicide vest, we can detect,” Carrillo said. Training to find threats before they’re visible.

Detecting flares and other risks

With international soccer crowds in North Texas, officials are also concerned about flares and fireworks brought into matches. Fans at European matches have sometimes lit multiple flares during celebrations, creating a red glow and a haze of smoke covering portions of the stands and the field, raising safety concerns for security officials.

Arlo is trained to detect flares and help prevent them from entering the stadium. Long days, high stakes. Arlington has 14 “vapor wake” dogs. For the World Cup, Carillo says 14 additional explosive-detection K-9 units have joined from agencies including the FBI and the ATF.

The workload is intense. “Their typical workday is a very long day, anywhere between 10 to 14 hours,” Carrillo said. The dogs take breaks roughly every 30 minutes and their reward is simple: praise and treats.

Securing the stadium before fans arrive. The work begins long before fans ever enter the gates. Arlo and other K-9 teams conducted an initial sweep of the entire stadium weeks ahead of matches to ensure it was clear.

Since then, everything entering the venue, including vehicles, supplies, and people, has been screened to maintain security inside the perimeter.

Original reporting: Dallas TX News (HLL/CB) — read the source article.