The Blur (Stanley Stewart), Supreme Power #06 (2004)
“You ever see one of those English Border Collies? Fast, strong, and smarter than any other dog on the planet. But you got to keep them busy, you got to give’em homework and projects and goals. I knew a guy had one, didn’t keep its mind occupied, and over the summer it took apart his front porch with its bare teeth, board by board.
You don’t give a dog like that something important to do, a problem to solve, it goes crazy. And the last thing the world needs is somebody like you going crazy, you know what I’m saying?”
Story: J. Michael Straczynski, art: Gary Frank
Thanks to towritecomicsonherarms for the tip.