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.

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