A dog named Luna high-fives a person in the Angelino Heights neighborhood of Los Angeles, California, U.S., August 26, 2022. (Photo by Mario Anzuoni/Reuters)

Guide dog Pinky is pet by her trainer during her graduation ceremony in Xochimilco on the outskirts of Mexico City, Mexico on December 2, 2023. (Photo by Raquel Cunha/Reuters)

Volunteer of the SICS “Italian rescue dog school”, during a water rescue training session, inside the Averno lake in Pozzuoli. Italy, on October 26, 2024. (Photo by Vincenzo Izzo/Sipa USA)

Passengers with their pet dogs take a pet-friendly train on the Jinyidong Line of the Jinhua Rail Transit on June 22, 2025 in Jinhua, Zhejiang Province of China. (Photo by Shi Bufa/VCG via Getty Images)

Sunday night, Lauren Watts searches for her dog in Mayflower, Arkansas., after a tornado struck the town. (Photo by Benjamin Krain/The Arkansas Democrat-Gazette)

Dogs perform during “Stars and starlets”, a new programme, at the National Circus in the Ukrainian capital of Kiev April 30, 2015. (Photo by Gleb Garanich/Reuters)

German flying ace Baron Manfred von Richthofen (1892–1918) also known as The Red Baron with his dog Moritz, circa 1916.

A dog sits in a plastic tub filled with water in Taipei, Taiwan, 28 July 2020. Betel nut seller Mr Luo, the dog's owner, said he puts his dog, a 12-year-old mixed breed called Ah Dai (Stupid), in a plastic tub filled with water whenever the weather gets hot. Ah Dai enjoys the bath and can sit in the basin for hours, according to Mr Luo. Luo has a dozen pairs of glasses for Ah Dai, so the dog wears different glasses every day and many tourists take photos of Ah Dai. (Photo by David Chang/EPA/EFE)