A dog's whiskers serve several important purposes. They help dogs navigate and sense their surroundings by providing crucial information about nearby objects, surfaces, and movements. Whiskers are sensitive to touch and vibrations, allowing dogs to determine the size and shape of objects, as well as perceive changes in their environment. Additionally, whiskers can help dogs with spatial awareness, aiding them in judging distances and avoiding obstacles. Overall, a dog's whiskers play a key role in enhancing their sensory capabilities and overall perception.