The Japanese version of the show shows that the characters all say Sherlock Hound's last name is Holmes. However, the English-dubbed episodes portray Watson calling Sherlock by the name of Hound (strange since in fact he's a fox, but the title "Hound" probably refers to the majority of the cast being dogs). See more
[English opening song
Help me, if you can, to find the smile that I lost / You're the only friend that can resolve all my problems / Sherlock Holmes, our detective so supreme! Sherlock Holmes, you're the only one for me! / Search the darkest corners for the love that I lost / Cure the thing that's torn us from the happiness we knew / Sherlock Holmes, our detective so supreme! Sherlock Holmes, you're the only one for me! / Well, you've got all the qualities we look for in a man / And everybody ...