Boo’s fame exploded around 2010, when his owner started posting his photos on Facebook which garnered 14M+ followers. He had a distinct teddy bear haircut, short and round on the face, fluffy on the body, that made him look like a plush toy. That haircut basically started a whole trend among small dog owners. His adorable expressions, big eyes, and fluffy body made him go viral fast. He gained millions of followers , and celebrities even collaborated with him. Boo passed away in early 2019 at age 12. Fans around the world shared messages mourning him it was like losing a little piece of the internet’s early wholesome era.