We've just picked up a beautiful check (white with colored markings) boxer pup. She's a paragon of health and good behavior so far so I can fix on a relatively minor issue. Her markings include two large dark brindle patches around her eyes/head/ears. The rest of her face is white but the furrows where her eyes run are red/brown. It looks like her mascara is running or like she's imitating Alice Cooper. I've seen some earlier postings suggesting That a switch to filtered water should clear up the problem, but she's already drinking purified water. Anything I can do to clear this up at the source or to clean it up?