A small dog is typically defined as a canine that weighs less than 20 pounds and stands under 16 inches tall at the shoulder. Breeds such as Chihuahua, Pomeranian, and Yorkshire Terrier are common examples of small dogs. They are often known for their playful and affectionate nature, making them popular pets for families and individuals alike. Small dogs can adapt well to various living situations, including apartments and homes with limited space. Their size allows for easier handling and transportation, and they usually require less exercise than larger breeds. However, they still need regular walks and playtime to stay healthy and happy.