I have a question about feeding my dog in winter. It gets down to -35 degrees C in winter season here, so the dogs spends more energy to keep himself warm during a walk. Therefore, should I increase the amount of food I give him?

Also I have a more general question: should a winter diet differ from summer diet in any way (quality-wise)?

Thank you.

As long as the dog is kept inside, it's not necessary to increase the amount of his food.