The pair is inseparable and that is exactly how Williamson wants it.
"We are best friends, thick as thieves, two peas in a pod - you name the cliché and it fits us to a T," Williamson tell us. "In about three years, Holly's been on more than 60 plane rides, visited at least four states, and worn more than 50 outfits. We get to experience all of these adventures together, and I can't think of a more fun companion to have by my side."
This kind of attention combined with Holly's many experiences has Williamson dreaming of writing a book. "I would love one day to write a series of Eloise-esque children's books telling the story of Holly's adventures (and ensembles) in Manhattan - donating proceeds to charities close to our hearts."
But for the near future, the two are just focusing on enjoying the summer and spreading the word. Up next for the two is an event at BarkBox on Aug. 6, where owners and their dogs can come to help raise money for the Jason Heigl Foundation, an organization founded by Katherine Heigl and her mother Nancy in memory of their brother and son. Its mission is to end animal cruelty by increasing awareness, supporting other nonprofits and find solutions for the pet overpopulation, among other goals. The event offers free food and will have raffle tickets with prizes including luxury collars, VIP tickets to a show and a prize pack of dog goodies from LazyBonezz.