The No. 1 bestselling author Stephen King's novella The Sun Dog, published in his award-winning 1990 story collection Four Past Midnight, is now available as a standalone publication.<br/><br/>It's mine - that was what he had thought when his finger had pushed the shutter-button for the first time. Now he found himself wondering if maybe he hadn't gotten that backward.<br/><br/>Kevin Delevan wants only one thing for his fifteenth birthday: a Polaroid Sun 660.<br/><br/>There's something wrong with his gift, though. No matter where Kevin aims the camera, it produces a photograph of an enormous, vicious dog. In each successive picture, the menacing creature draws nearer to the flat surface of the Polaroid film as if it intends to break through.<br/><br/>When old Pop Merrill, Castle Rock's sharpest trader, gets wind of this phenomenon, he devises a way to profit from it. But the Sun Dog, a beast that shouldn't exist at all, turns out to be a very dangerous investment.