Titled as the world’s cutest dog, Boo is one of the most popular animals that have gone viral on the internet. He is a Pomeranian with an adorable haircut and an enormous wardrobe, and has, on top of having more than 6 million fans on facebook, is the model for several photo books and commercials. 

Despite the cuteness, this dog’s owner worked her social media very well in terms of promoting the virality of the image of her dog. People also tend to not want to miss out or not know what these popular things/animals/characters are, hence his popularity and desirability grew with his audiences.