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A "dog dimension" where "dogs were people and people were dogs" was a parallel universe theorised to exist by the Thirteenth Doctor.
Fearing for the fate of her universe if she were to be trapped in a such a dimension, the Doctor wrote a book containing a set of challenges and instructions intended to allow whoever found the book to temporarily take on the mantle of "the Doctor". (PROSE: Meet the Fam [+]Loading...["Meet the Fam (short story)"])