A Dinosaur in the Garden

I have it on good faith that a dinosaur named blue-ahsaurus lives in our garden. The story goes that he is rather large and turns into a rhinoceros the moment he comes into the house. From there on the story becomes really animated with lots of sound effects and stomping around the lounge. A giant pre historic predator on a course of destruction through our little home complete with roars, crashes and claws.

I have visions of a surreal Calvin and Hobbes comic book future