Welcome to YT!
Yes, winter is hard on their skin however the right food and plenty of fresh water will help that balance on the skin.
I feed my dogs, exclusively, Life's Abundance. It is an all-natural food and the only additives are probiotics for skin and coat health. If you want some samples just pm me with your mailing address. Complimentary, of course!
I used to raise Min Schzs - due to the constant grooming they would also develop drier skin.
Glad you found YT!
If you want more information just look at my signature below - you can go there and do some preliminary research.