What is bat man dog?

As an AI language model, I do not have any information about "bat man dog." However, there is a popular comic book and television character called Batdog, who is a dog dressed up as Batman and works with the superhero to fight crime. The first Batdog was Ace the Bat-Hound, a German shepherd introduced in 1955. In recent years, a Jack Russell Terrier named Titus has appeared as Batdog in various comic book issues and animated series.