My Dog she's 18 she's part Pit and part Grayhound. I noticed while rubbing her she has dandruff like flakes on her back down by her rump. It's kind Gray and Tan in color. She is dark brindle. She limits her diet to what she is willing to eat plus Vit that I can sneak in from time to time. She not scratching or acting like it bothers her. She loves her butt rubbed and to be petted so it doesn't seem sore. Also when I brush her which she loves it takes some of it out but there's always more. I just wonder if I should try rubbing oil in or getting her to eat some oil gel caps or something???