If Fiona is 3, you should try the Mr. Putter and Tabby books and the Cobble Street Cousins series, both by Cynthia Rylant; B. loved them at that age (and through about age 5 and will still pick them up as an easy comfort book). Both are "real world" settings but the cat and dog in the Mr. Putter series are anthropomorphized (without actually speaking) and their older grandparent-ly owners do goofy things that little kids think are funny. Our good friend L. loved Cynthia Rylant's Henry and Mudge series but B. never got into them.
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