A photographer tested the concentration of several pairs of dogs as he captured their reactions to treat time in a series of shots. Christian Vieler, 47, of Waltrop, Germany, has been a professional dog photographer since 2016. He came up with the idea of snapping two dogs catching treats simultaneously. Here: Basset Hounds. (Photo by Vieler Photography/Caters News Agency)

A French bulldog wears a costume at the annual Pet Expo 2021 in Bangkok, Thailand on November 25, 2021. (Photo by Athit Perawongmetha/Reuters)

Class of 2027 plebes climb during the Herndon Monument Climb at the U.S. Naval Academy, Wednesday, May 15, 2024, in Annapolis, Md. Freshmen, known as Plebes, participate in the climb to celebrate finishing their first year at the academy. The climb was completed in two hours, nineteen minsters and eleven seconds to complete. (Photo by Tom Brenner/AP Photo)

Women with red paint on their bodies participate in a rally to mark International Women's Day, in Bogota, Colombia on March 8, 2023. (Photo by Mahe Elipe/Reuters)

Old Heidelberg, Dog with Pipe, 1905. (Photo by Detroit Publishing Company)

Fans attend the World Premiere Of Marvel Studios' “Captain America: Brave New World” at TCL Chinese Theatre on February 11, 2025 in Hollywood, California. (Photo by Frazer Harrison/WireImage)

A squirrel begs for food from a scooter driver in a park in Moscow on September 2, 2025. (Photo by Alexander Nemenov/AFP Photo)

A close up of a caracal lynx's face looking into a camera on January 2014 in Western Cape, South Africa. (Photo by Dale Morris/Barcroft Media)