Roscoe is ALL BOY and he LOVES getting really dirty! As a consequence, he gets a bath at least once a week, and sometimes two or three times per week. Our concern is that we're going to dry his fur (and skin) out too much. He's a terrier mix, so he doesn't really have smooth, soft, fur to begin with, but we want to keep his coat healthy. Any recommendations about how we can do this with his frequent (sometimes more frequent than others) baths?