Roald Dahl’s Fantastic Mr. Fox springs to mind as well.
You can claim Curious George, but Stuart Little has been mentioned.
The Mouse and His Child by Russell Hoban.
Jenny and the Cat Club The story of shy jenny and the cat club she wants to belong too and her new friends she makes.
This is a classic that was recently reissued.
I LOVED the Sweet Pickle Series when I was a kid:
There are more, but those three were my favorites!
And of course, animals are involved in plenty of everyday adventures in Richard Scarry’s books.
AAAAAH! Sweet Pickles! I’d completely forgotten about those…they had to have been one of my favorite series as a kid!
Babe the Gallant Pig needs to be added to this.
We recently finished Martin’s Mice at our house. Farmcat decides to keep mice as pets instead of eating them.