I use Four Paws Paw Guard with Lanolin in my dogs paws during the winter months. I live in Ohio and we have lots of snow, ice, and bitterly cold days during the winter months. This product protects my dogs paws from the damaging effects of sidewalk salt. The lanolin also keeps his paws soft. And it also seems to keep his paws warmer while he's outside doing his business. I can't imagine not using this during the winter. It only takes a couple of minutes to apply. My dog doesn't mind when I apply this product at all. Actually he seems to enjoy it. Because he gets a little foot massage while it's being applied. I would suggest anyone that likes in an area where salt is used. It is so harsh on dogs paws. I always wiped down my dogs paws when he came inside after a potty trip. . Quality of Ingredients Very high quality ingredients. The lanolin is superb! Side Effects We haven't had any side effects and I can't see why anyone would. Although I'm sure it's possible.