My dad read the Geronimo Stilton books to us when we were in elementary, and they have lots of pictures and fun font changes on certain words so it should still be good for when they're that young. Although if you're already reading full on Dahl to them then it might be beneath them lol.

The Fire Cat was a book I liked and kids seem to enjoy. It's about a cat in a firehouse, not a furry's OC, I promise.