I have a sheltie 5 years old and have him groomed 6 times a year. In between grooming he gets a bath at home twice a month. He has a musty skin odor after about two or three days. I have spoken with the groomer and was told he has dry skin and I should talk to a vet about it. He doesn't have hot spots or skin disease but he starts scratching and shedding a lot. We have the dog trimmed every summer and this releives the problem for a while. What can I use to keep his skin as good as it should be. Does anyone else have this problem