There are 3 books in the Zones of Thought (Qeng Ho) series. The newest book is The Children of the Sky which came out in 2011.

Fleeing a menace of galactic proportions, a spaceship crashes on an unfamiliar world, leaving the survivors - a pair of children - to the not-so-tender mercies of a medieval, lupine race. Responding to the ship's distress signal, a rescue mission races against time to retrieve the children.
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2
A Deepness in the Sky

A Deepness in the Sky

This is science fiction on the grandest of scales - a cast of thousands set across hundreds of years and in the farthest reaches of Human Space. A prequel to his earlier novel A Fire Upon the Deep, this new novel is epic in scope and a thoroughly riveting read.…

3
The Children of the Sky

Book cover of The Children of the Sky
Ten years have passed on Tines World, where Ravna Bergnsdot and a number of human children ended up after a disaster that nearly obliterated humankind throughout the galaxy. Ravna and the pack animals for which the planet is named have survived a war, and Ravna has saved more than one…