Ruler of the Universe

...(or Uniskees, long story) is one of Rudy's many nicknames. Your animal friends are probably also laden with several terms of endearment specific only to them. Rudy's list is extensive, including Rude Boy (his original moniker), Ru-Ru, Rooskers, Runey, Runers, Ruler, and so on, culminating in Ruler of the Universeskees, which he thinks he is. :)