Of the animals that were once launched into space by humans, the dog Laika is the best known. The Russians launched this quadruped in November 1957 with the Sputnik 2. She became the first living creature to orbit the Earth, but did not survive the adventurous journey. Laika died of overheating and stress before the fourth round was completed. Three years later, the Russians again sent two dogs into space: Belka and Strelka. Unlike Laika, they did return to earth alive.
From the 1950s, space organizations decided to experiment with animals, mainly to investigate whether humans could also make space travel in the long run.

On August 19, 1960, Belka and Strelka were launched. A day later, after a journey of about 700,000 kilometers, they returned to Earth alive. The two four-legged friends were world famous in one fell swoop. They were the first living beings to travel into space and return alive. The successful operation was widely reported by the Soviet Union. The two dogs weren’t alone aboard the Sputnik, by the way; they were accompanied by a rat and some mice.
During their historic journey, Belka and Strelka were fed automatically twice. Belka was two years old during the expedition and weighed almost five kilos. Strelka was slightly older and weighed over a kilo more. The two animals are said to have been selected especially for space travel based on their calm and balanced nature.
Pupniks
Belka and Strelka were set up after their deaths. They are now on display at the Cosmonaut Museum in Moscow. In 2010, Google spent a day with a modified logo on the space journey of the two Russian dogs.