During the cold winter months, some dogs require an extra layer of protection against the elements. Input: dog hoodies. Dog hoodies provide a blend of function and fashion, maintaining your pooch warm and looking trendy. Little dogs with short hair, and dogs are more likely to desire a hoodie or sweater to stay warm in winter. If you notice your dog shivering when you go out for walks, you might want to decide on a dog hoodie to keep him warm. If you live in a region where winters are extremely cold and filled with snow, then look at getting your dog a winter hoodie .