Storm Over Warlock. by Andre Norton

A brutal force of insectoid aliens called Throgs effortlessly destroy a Terran survey camp on Warlock, a planet seemingly devoid of intelligent life that both Throgs and Terrans hope to colonize. Two Terrans who survive the enemy attack must go on the run, weaponless and with only a pair of wolverines as their companions. These survivors are driven to an unknown destination by dreams so powerful that they may be visions ; but as they get closer to their goal, crossing brutal landscapes, tumultuous seas, and fog-filled caverns, the two find themselves losing control over their actions and unsure of what is real in this strange and hostile world.