If you like the world of Little Fuzzy, it's worth reading Fuzzy Bones by William Tuning and The Golden Dream by Ardath Mayhar. Both are, effectively, authorized Little Fuzzy fanfic. Tuning's book came out before they discovered the manuscript for Piper's third Fuzzy book, so it contradicts some of what's there. The Mayhar book is entirely from the point of view of the Fuzzies. It covers some of their history before humans came along, but it rests on Tuning's story ideas, so reading the Tuning first makes some sense.