Kingdom: The Promised Land — Dan Abnett

In a distant future, genetically engineered dog-soldiers combat an alien enemy keeping the last place on Earth safe for the slumbering Masters, who await the day they will rise again.

Charged by the urgings of their Masters, the pack led by alpha male Gene the Hackman, patrol the land scrapping with Them.  Fighting at the behest of the Masters. The orders are simple; keep Them off of their lawn!

But Them are many, an army of enormous bugs, and as the pack is diminished, Gene is drawn toward one of The Masters, changing his world forever!