DoggoLingo, sometimes referred to as doggo-speak, "seems to be quite lexical, there are a lot of distinctive words that are used," says Internet linguist Gretchen McCulloch. "It's cutesier than others, too. Doggo, woofer, pupper, pupperino, fluffer — those have all got an extra suffix on the end to make them cuter."
2017 April 23, Jessica Boddy, “Dogs Are Doggos: An Internet Language Built Around Love For The Puppers”, in NPR All Tech Considered