I love Olivia books. Olivia the Fairy Princess is great as she decides that she wil be the Queen! Plus her posters in her room are awesome. I also love Olivia Saves the Circus. She used the phrase, "to the best of my recollection.". Holy olivia, Esq. Batman!
Violet the Pilot. For budding female engineers everywhere.
And for you as a dog lover, it is out of print, but The Other Dog. It is written from the dog's perspective and beautifully illustrated. You can buy used. Adorable!
The Red Ranger Came Calling and Pete and Pickles by Berkeley Breathed are both wonderful. DS has likes them since he was very young and I haven't gotten tired of reading them. Good messages too.