There is a rare Japanese dub of Blue's Clues that has only been found on the Japanese Nickelodeon website. Rather than the dub having a different host than Steve and Joe like in the British, European Portuguese and Korean dubs, instead their voices are dubbed over by Japanese voice actors. There are two videos of the Japanese Blue's Clues that have been uploaded to YouTube as of 2/20/2016. As of 3/3/2016, one of the videos sadly has been blocked in the US by B_Viacom.
EDIT: 7/14/19 both videos on YouTube got deleted making them unwatchable