It’s very much a VERY early reader (Ready-to-Read Ready-to-Go!, which comes before Pre-Level one). It has only one to two sentences per page, and those are very short, direct, and repetitive, to the point of stilted reading. Normally stilted writing annoys me, but this works almost like a wordless book, where the bright, amusing illustrations tell a complete story even without the text: Cat and Dog play tricks on each other, taking turns claiming possession of a stuffed dinosaur until one of the tricks backfires and the dinosaur falls down a hole, where Mouse gets to claim it; Cat and Dog solve their problem by working together to put on a play to earn enough money so they can each purchase their own stuffed toy, which makes Mouse happy too, since he’s the storekeeper who gets their money.