Normally I wouldn't mind as long as credit is given, but since I actually use this image as my own avatar in a lot of places I'm not sure I'd be comfortable with that. It's sort of become part of my "brand identity" if that makes sense.
No way! "Derpina" is one of the names that my very derpy doggy has received, though my husband prefers "The Derp" as her title. Perhaps the derpy cats and dogs of the world should get together in a derpy coalition, a derpocracy if you will. XD