The movie is based on the true story of Soviet space dogs Belka and Strelka that were the first living creatures that had been in the space and returned back to Earth. They were homeless mongrels, living in Moscow, and they were chosen intentionally, not only because pedigree dogs are weaker for survival, but also to show that "capitalistic" elitist ideas are crap according to theory of Communism.
It was released in Russia on 18th March, 2010. And the bad thing is that American 3D feature How to Train Your Dragon was released in Russia on the same day, a week before premiere in States and other countries, so Russia and CIS was the only territory where American distributors released the movie earlier. I doubt that it was made unintentionally.
Space Dogs will be released internationally (in English-speaking countries) in the summer of 2010. As you can judge from the trailer, it is completely dubbed in English.