The selfie is the most popular photography trend of the internet today. It's gotten so popular, in fact, that even our beloved feline friends have started to catch on. I dare you to keep the smile off your face for this one!

Throughout the course of the long war in Afghanistan, Coalition troops have relied on thousands of military working dogs to help keep them safe, and make their jobs easier. The dogs are trained to detect explosives, to find illegal drugs, to search for missing comrades, or target enemy combatants. Not only are they active on the front lines, but behind the lines they serve as therapy dogs, service dogs, and loyal companions. They also share the same risks as the ground troops, suffering injuries and sometimes death on the battlefields. Gathered here are images of these dogs and their handlers in Afghanistan and back home, from over the past several years, part of the ongoing series here on Afghanistan.

Actress Lily Collins is seen filming on set of series 2 of “Emily In Paris” on May 4, 2021 in Saint-Jean-Cap-Ferrat, France. (Photo by Arnold Jerocki/GC Images)

US actress Tiffany Haddish attends a photocall for the film “The Card Counter” presented in competition during the 78th Venice Film Festival, on September 2, 2021 at Venice Lido. (Photo by Yara Nardi/Reuters)

American singer-songwriter Ashley Nicolette Frangipane, known professionally as Halsey is seen in Midtown on October 07, 2021 in New York City. (Photo by Gotham/GC Images)

American singer-songwriter Olivia Rodrigo wishes her famous bestie, actor Iris Apatow, a happy birthday on October 12, 2021. (Photo by Instagram)

Irish television personality, model, and social media influencer Maura Higgins looked unrecognisable as she transformed into Pamela Anderson for Halloween on October 30, 2021. The 30-year-old star looked glam in a blonde curly hair as she channeled the Baywatch babe for an Ann Summers bash last night. (Photo by Shutterstock/Splash News)

Actors Alexandra Shipp and Vanessa Hudgens attend a premiere screening for “Tick, Tick . Boom” during the opening night of AFI Fest at TCL Chinese theatre in Los Angeles, California, U.S. November 10, 2021. (Photo by Mario Anzuoni/Reuters)