We have livestock as well as pets, and they are all given extra protection during the winter months. Our outside cats and dog are given a more sheltered location with extra straw for bedding, and the livestock is also given extra straw. In addition to the straw and shelter, they are also given a richer diet and more food when it is cold. This helps them keep warm and they can tolerate the cold better. One of our dogs spends the winter inside with us, but prefers to spend days and nights outside in the summer.
When it comes to the summer heat, the only animals we have that we have noticed to be really bothered are the alpacas. They will become more stressed in the heat than the cold.