The SF books with utterly no Humans seem to come in two branches ' those where humans once existed and are now extinct, or gone away, or legend, (example City, by Simak, or a number of works where it is robots, mankind's direct creations, that inherit the Earth, or Empire, or whatever. Just occasionally mutated exhumans get a look in, or the stories where humans have no part in creation at all - I'll cite John Brunner's 'The Crucible of Time', which I liked but nobody else seems to have read, or Robert Sawyer's Quintaglio (Far-seer) series.
The books with one or very few humans they are frequently used as comparison references references, making the aliens more alien (except maybe Cherryh's 'Chanur' series where Tully is stranger than his captors or saviours), a little like Lemuel Gulliver and his hominid/equoid contacts).
Most of these unbalanced contrast stories are comparing societies, rather than species.