On August 19, 1960, the Soviet stray dogs Belka  and Strelka won themselves worldwide fame and glory after successfully  performing a 24-hour Earth orbit on the Vostok spacecraft and returning  back on Earth safe and sound.
http://starchild.gsfc.nasa.gov/docs/StarChild/questions/question49.html

On August 19, 1960, the Soviet stray dogs Belka and Strelka won themselves worldwide fame and glory after successfully performing a 24-hour Earth orbit on the Vostok spacecraft and returning back on Earth safe and sound.

http://starchild.gsfc.nasa.gov/docs/StarChild/questions/question49.html