What is the smallest dog breed in the world?

The smallest dog breed in the world is the Teacup, but this is a relative term. As the Guinness Book of Records records the world’s smallest dog as a long-haired Chihuahua, a record that was later broken by a Maltese dog. Therefore, for the group, the smallest dog in the world is the teacup, while for the individual, this answer may change over time.