In this picture off Plue from the Rave Master wiki, it's stated to be a horn/nose.
But what exactly is that yellow thing? Is it a nose or a horn? If it's nose, can Plue smell with that?
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Most site, even Rave wiki always refer it as a nose due to its position that like a nose. But actually it's not both, it looks like horn, and the position is more like nose but it's the weapon that only Plue has
Just like that picture says, even Hiro Mashima not sure what it is. (or he just didn't want to tell us)