The stray dog who became the first living creature to orbit the Earth

Nature · Published 3 October 2026 Swipe more like this →

In short: In 1957, a Moscow stray named Laika was launched into orbit aboard Sputnik 2. While the mission provided essential data for future human spaceflight, it was a one-way trip from the start. Overheated and frightened, the petite pioneer became a global icon for a mission that lacked any return technology.

Laika, a three-year-old husky-spitz mix, was chosen by Soviet scientists for her placid temperament and small size. Recruited from the streets of Moscow, she was one of several strays subjected to rigorous testing, including confinement in tiny pressurized capsules and exposure to loud noises. The mission was a rushed political maneuver, ordered by Premier Nikita Khrushchev to coincide with the 40th anniversary of the Bolshevik Revolution. With less than four weeks to build the spacecraft, engineers worked without blueprints to create a pressurized cabin for the dog.

On November 3, 1957, Sputnik 2 lifted off with Laika aboard. The launch was physically punishing, with g-forces reaching five times normal gravity. Sensors embedded in her body recorded her heart rate tripling and her breathing rate quadrupling during the ascent. Although the Soviet Union initially claimed she survived for several days, it was later revealed that she died within hours of launch. A failure in the heat shield caused the cabin temperature to exceed 90 degrees Fahrenheit by the fourth orbit, leading to her death from overheating.

The mission was a grim necessity in the eyes of Soviet planners, who believed animal testing was the only way to determine if a living creature could function in space. Despite the tragedy, the flight proved that an organism could survive the launch into orbit. While the Soviet government maintained a fiction of her survival for years, the reality of her fate eventually sparked international protests from animal welfare groups. Today, Laika remains a symbol of the early space race, remembered as a pioneer whose involuntary sacrifice helped pave the way for human cosmonauts.

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