The Guardian Hound — Leah Cutter

Lukas first dreams about the end of the world when he's five. As a prince of the hound clan, he is steadfast and loyal, able to take the form of any hound. Yet, no one believes him except his grandmother. The shadows, a corrupting force determined to suck the life out of everything on Earth, have infected the hound court. How can Lukas survive to adulthood? Then battle non-corporeal creatures and save the world?