What is the climax of book roverandom?

The climax of C.S. Lewis's *The Horse and His Boy* (not *Roverandom*) is the battle at Tashbaan. There isn't a book called *Roverandom* by C.S. Lewis. There *is* a short story with that title, but it doesn't have a climax in the traditional sense of a single, decisive moment. Instead, the narrative arc culminates in Rover's return to his normal size and his reconciliation with his owner. This might be considered the resolution rather than a climax.