A mini Yorkshire terrier from New Jersey is now the holder of a very big world record: world’s smallest working dog.

Lucy, who weighs just 2 1/2 pounds, was named the world’s smallest working dog last week by Guinness World Records. In the process, she doggedly beat out the previous record holder: Momo, an eight-year-old chihuahua from Japan that works as a police search-and-rescue dog.

The tiny terrier makes her rounds each week, visiting hospitals, nursing homes, and rehabilitation centers. She also works with children with disabilities, and troubled youth.