Animal deaths by euthanasia

Félicette () was a Parisian cat that became the first feline launched into space on 18October 1963 as part of the French space program. She was one of 14 female cats trained for spaceflight. The cats had electrodes implanted into their skulls to monitor their neurological activity throughout the flight. During the flight, electrical impulses were applied to the brain and a leg to stimulate responses. The capsule was recovered 13 minutes after the rocket was ignited. Most of the data from the mission was of good quality, and Félicette survived the flight but was euthanised two months later

Thoroughbred racehorse; winner of U.S. Triple Crown of Thoroughbred Racing in 1973

Soviet spacecraft

northern white rhinoceros

world's only known gorilla with albinism to date (1964–2003)

cat belonging to Bill Clinton and family

mass killing of pets in 1939

Kodiak Bear that appeared in several Hollywood films

sheep

Australian cattle dog; previously oldest verified dog

Uggie (February 14, 2002 – August 7, 2015) was a trained Parson Russell Terrier famous for his roles in Water for Elephants and The Artist. His memoir Uggie, My Story was published in the United States, the UK, and France in October 2012.

Japanese-bred Thoroughbred racehorse

mice that flew to the moon on Apollo 17

Thoroughbred racemare from Japan

Thoroughbred racehorse

Valegro (5 July 2002 – 1 December 2025) was a gelding ridden by the British equestrian Charlotte Dujardin in the sport of dressage. He stood and had the stable name of Blueberry. He was a double World Champion in Dressage, he won Grand Prix Special and Grand Prix Freestyle at the World.

Japanese-bred thoroughbred racehorse

American pet (c. 2017 – 2024)

dog

Australian horse

Japanese-bred Thoroughbred racehorse

blind pure-bred Chinese Crested hairless dog

Japanese-bred Thoroughbred racehorse

walrus euthanised in 2022

sea otter at the Monterey Bay Aquarium

world's oldest diprosopus cat

female polar bear

Polar bear

Bornean orangutan at the San Diego Zoo

sixth Chief Mouser to the Cabinet Office