Many of you that never owned or met an actual hedgehog are probably confused by this comic.  No, Sonic didn’t suddenly get rabies.  He’s just self anointing, a thing that hedgehogs actually do.  It’s an odd behavior where when they taste or smell something they really like, they’ll create a foamy lather that they’ll then apply to their quills.  It’s an interesting site to see, especially for a cobalt blue, anthropomorphic hedgehog.