The Uplift War by David Brin

In a science fiction universe where a galactic civilization is built on the patronage and "uplift" of pre-sentient species into intelligence, a human colony on a distant planet finds itself embroiled in an interstellar war. The planet's inhabitants, including humans, their uplifted chimpanzee allies, and other indigenous species, must navigate the complex politics and military strategies of various alien races. As they struggle to defend their home and assert their place in the cosmos, they uncover deeper mysteries about the origins of intelligence and the true nature of uplift, challenging the established order of their star-spanning society. The 9886th greatest book of all time