Dinosaur Bowser Junior is the dinosaur version of Bowser Junior. In Bowser Junior's Three Wishes, Bowser Junior turned into a dinosaur by wishing that he was a dinosaur. Bowser, Toad and, Chef Poo Poo thought he was a real dinosaur at first when Bowser Junior as a dinosaur said "I'm a dinosaur"
He reappears in Bowser Junior's 6th Birthday when Bowser Junior wishes he was a dinosaur for his birthday and becomes the dinosaur and eats the cake.
According to everyone, Dinosaur Bowser Junior is extremely annoying.