If your dog is leaving white flakes everywhere it goes, it might have developed a nasty case of dandruff. The last thing you want to deal with is a layer of white powder on your furniture, or dandruff flakes on your clothes every time you brush your dog. Luckily, most cases of dandruff aren't signs of any significant health problems. They're just a nuisance. Luckily, there are some simple remedies for doggy dandruff.