Why dogs need underwear? As with people, a snug and comfortable underwear serves not only to keep one warm, but also as an under layer for outer, often stiffer layers of clothes, which might abrade the skin when worn right on the body. Since we strive to take the best care of your pets, we were the first to introduce the idea of dog underwear as early as 2009. Today, underwear and functional undershirts has become a common part of dog outfit and the cornerstone of our dog wear collection.