So, what's four-foot long, handy for pet attachment and covered in the Riddler's trademark question mark symbol®? Why it's the Riddler Symbols Dog Leash, of course! Okay, so if you're even going to qualify that as one, it was a really weak riddle - considering you're on this page and looking directly at the answer to said 'riddle'. Actually, it probably made Riddler fans everywhere wince. But fans of Batman's crazy conundrum-spouting nemesis will be immediately heartened by the existence of the Riddler Symbols Dog Leash, which will allow them to properly trumpet props to their favorite Batman villain!