This is so good experience!! Yo should not miss it while in Moscow.
Russian circus are much more better than in Western Europe. Sometimes you will see amazing show of dogs, or cats, and acrobats performing incredible jumps.
Only in North Korea I was so much impressed in a circus like in Russia.
There is another circus in Moscow, in Tsvetnoy bulevar, where soon I will get, founded by the famous russian clown Nikulin (already dead) that should be fantastic. I will explain you about it as soon as I will visit.