Even though Tom Otterness, who just installed his newest creation in DUMBO, cheers up commuting New Yorkers underground...he has a dark past that wouldn't make anyone smile. The artist, in short, shot a dog (that he adopted) for the sake of "art" -- something he did, and filmed, 20 years ago. He's apologized for the unforgivable act, but with each new piece he creates or installs -- it seems his past will always come back......