If the skin issues started after the food change, I would assume it was a food hypersenitivity issue. But for some dogs, cold dry air does cause skin dryness. Since I’m a big believer in the benefits of rotational diets, I would suggest changing the food, even if it is just a dry skin issue. Take the ingredient list with you to the store and get something that is as different as you can find. Keep that ingredient list though. If the food change solves the problem, you know that there is an ingredient on that list that your dog can’t handle. So then you need to start saving lists on all the foods you feed whenever you change foods and compare them to see if you can figure out what she is reacting to.
If you think it may just be dry skin, you can start adding oils to her food, like fish oil or coconut oil. Start with small amounts and work your way up or it will upset her system. She can have up to 1 teaspoon/20 lbs body weight added to her food, but start with about 1/4 teaspoon. Remember that this is pure fat and decrease her regular food as needed.
