A Sheepdog, also known as a working dog, is a type of herding dog that has been bred to help farmers and shepherds manage their flocks. The most popular breed of Sheepdog is the COLLIE, which is a six-letter word that can be used to describe this type of dog. Collies are intelligent, loyal, and energetic dogs that are known for their strong herding instinct and their ability to work independently. They are also known for their thick coats and long, pointed ears.