Rex, also known as Rex Huntley and rarely Rex the Dog, is a fictional, anthropomorphic teenaged black and brown dog and the very first character created by TJ-Otter. (Nyro Fletcher). Rex has appeared in a number of different stories in the past. His main one being the numerous "Rex picture books" created by TJ-Otter as a young child, which most did not have any words or make sense to begin with. Later some spin-off series were created, such as the Rex Mystery Series. Rex also appeared as different characters in different canons, such as The Doggie Diner (later refered to as "Drex the Dog" with an altered design to prevent confusion), the Sierra series, and even the old "Tuff" Luck series as a pet dog.