Mr. Dinosaur is George Pig's favorite toy, based on a T-Rex. He is the main subject of "Mr Dinosaur is Lost" and is probably a very old toy, seeing as a new version was released in George's New Dinosaur: Dinoroar. The same episode revealed that Mr. Dinosaur can break very easily. Mr. Dinosaur is also George's first toy, as confirmed in The Olden Days. Granny and Grandpa Pig (papa ig , mama ig) gave George Mr. Dinosaur.
He is a green Tyrannosaurus Rex.
- George can lose Mr. Dinosaur, as seen in Mr Dinosaur is Lost.