Dust doesn't just look dingy; it's made of pet dander, human skin cells, dirt, grime, pollen, and more icky stuff that causes all sorts of health issues. (rismedia.com)
If the dog runs outdoors, the coat will start looking dingy in about a week. (komondorrescue.com)
But your laundry still looks dingy and has stains that won't come out. (thespruce.com)