She’s a tiny cutie with a titanic title.

Lucy, a New Jersey certified therapy dog who weighs about 2.5 pounds, has been named the world’s smallest working dog by Guinness World Records.

“I call her small but mighty,’’ owner Sally Leone Montufar said of the adorable Yorkie, who is 5.7 inches tall and “volunteers” through the program Leashes of Love in Cherry Hill, visiting hospitals and nursing homes and working with autistic kids.

“She’s got a sweet personality.’’