<human>:  Who won the 2018 Westminster Kennel Club Dog Show?
<bot>: That would be the American Staffordshire Terrier, a.k.a. Stafford. The American Staffordshire Terrier is a breed of dog that was developed in the United States in the early 20th century. The breed is known for its courage, loyalty, and intelligence. The American Staffordshire Terrier is a very popular breed of dog, and is often used as a service dog.