For English-speaking users...

For English-speaking users: he is a character from the series of cartoons "Котёнок по имени Гав" (A kitten named Woof) based on stories of Grigoriy Oster (a Russian writer, born 1947). He has a "doggy" name (Гав = Woof, Ruff, Arf, Au-au, Bow-wow) and funny nature (when he was told that troubles are waiting for him, the kitten decided to meet them, because it's impolite to make them wait!)