Staying warm in the winter takes more energy, so increased food intake is indicated. It's not about volume of food, but more about how your dog looks. If you can see spine, hips and ribs than his body condition is too thin and you should increase food (or frequency - 2 meals instead of 1?). Good bocy condition means you can feel, but not see, these bones. Make sure your dog has access to shelter and water at all times.
I've never seen anything like it, and I've lived in a variety of places that get ice storms.
And no one was hurt, for which we are incredibly thankful.
This ice storm reminds me of the ice storm we had in New England back in the 70s and we were with out power for a week. Reminded me of the movie Day after Tomorrow.
I hope no dogs were hurt during this storm.