Thundershirt is an excellent solution for dogs that are fearful in certain situations. The Thundershirt helps the dog without requiring feeding supplements or medicine. A Thundershirt is a gray vest that fits tightly around the body and applies a soft, constant pressure. This pressure has a calming effect on the nervous system, which is also applied to newborn children (swaddling) and people with anxiety disorders. The pressure applied by the vest relaxes the dog. It is effective in situations that scare the dog, such as thunderstorms, fireworks, etc. Some dogs need to get used to the vest.