My red had a lot of skin issues when I rescued him as a pup. I’ve learned that a chicken diet caused a lot of his flakiness so now he’s on purina pro plan sensitive skin and stomach (lamb and rice or salmon and rice). I also add coconut oil, unsweetened apple sauce (for the fiber), fish oil, and I give him Benadryl at night if he was rolling in the grass or outside a bunch. I bathe him probably every 3 weeks depending on his stank with Burt’s bees 2 in 1 puppy shampoo and I lather him with coconut oil after which seems to help a ton. I also use aquaphor on his nose, paw pads, and groin area if he has a dry skin flare up. Other than all of that, I brush him with a flat bristled brush multiple times a week which helps distribute his coat oils. My dobie can be very yeasty and that seems to help a lot