My standard poodle, Story, is technically white. More often than not, he’s whatever he’s rolled in: grass stains down one flank, a smear of mud on his ankles, the dingy off-white of a dog who approaches the world with enthusiasm and very little discretion. So this spring, for the first time, I gave him a color he didn't earn by frolicking in the great outdoors : purple. Story’s groomer didn’t dye his whole body—just the puffy fur around his ankles, ears, and the tip of his tail, which fades