Dogs Belka and Strelka spent 1 day in space aboard Sputnik 5 on 19th August 1960 before safely returning to Earth. This is about 8 months earlier than the first man in space, Yuri Gagarin who went up in April 1961.
The dogs had other companions too: a grey rabbit, 42 mice, 2 rats, flies and a number of plants and fungi.
The following are pictures of what it was like inside their capsule. The first picture is apparently of Laika, the first earth-born creature in space. Unfortunately s/he did not survive the flight:
This is a model of them and their spacecraft on display:
Everybody survived the flight.
They were the first Earth-born creatures to go into orbit and return alive.
Truly deserved to be featured on stamps and commemorative cards!
So now you know what to name your next puppies.
Images are sourced via google image search.