I’ve had a dog who has been dealing with chronic ear infections. He would itch his ear and shake his head profusely to the point that he would give himself hematomas. An ear hematoma is when the ear fills up with blood. It’s basically the same thing wrestlers and jiu jitsu players get. The ear fills up with blood inside the ear flap and leads to what's called cauliflower ear.
Another thing I do in the winter is cook my dogs a homemade bone broth. I don’t do this every day, but when the weather is extremely harsh or I have some extra time, I make a large batch and give it to them in the evening.