Blue, despite what his name implies, is not actually a blue dog. In fact, that would be kind of silly. He possesses more of a grey coat of fur, and sometimes it can even be shiny.
He will also not appreciate it if you attempt to imply that he was named after, or has any relation to, the pooch in the once-popular children's television show Blue's Clues. Don't even mention it to Blue, or he might bite your shoelaces.